USP Reference Standards -L, chemical structure, molecular formula, Reference Standards

USP Labetalol Hydrochloride RS— Dry portion in vacuum at 105

for 4hours before using.Keep container tightly closed.Protect from light.

USP Lactase RS.

USP Lactitol RS.

USP Anhydrous Lactose RS— Dry portion at 80

for 2hours before using.Keep container tightly closed.

USP Lactose Monohydrate RS— For identification test,dry a portion at 80

for 2hours.For quantitative use,determine the water content titrimetrically at the time of use.Keep container tightly closed.

USP Lactulose RS— Dry portion at 70

for 4hours before using.Keep container tightly closed.Store between 2

and 30

USP Lamivudine RS— Do not dry.Keep container tightly closed.Protect from light.Store in a freezer.

Change to read:

USP Lamivudine Resolution Mixture A RS— Do not dry.Keep container tightly closed.Protect from light.

Store in a freezer.

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USP Lamivudine Resolution Mixture B RS— Do not dry.Keep container tightly closed.Protect from light,and store at controlled room temperature.

USP Lanolin RS— Keep container tightly closed,and store at controlled room temperature.

USP Lanolin Alcohols RS— Do not dry.For compendial purposes this material has an acid value of 0.45and a saponification value of 4.

USP Lansoprazole RS (C16H14F3N3O2S

369.36) —Do not dry.Keep container tightly closed.Protect from light.Store in a cold place.

USP Lansoprazole Related Compound A RS [2-[[[3-methyl-4-(2,2,2-trifluoroethoxy)-2-pyridyl]methyl]sulfonyl]bezimidazole] (C16H14F3N3O3S

385.36) —Do not dry.Keep container tightly closed.Protect from light.Store in a cold place.

USP Letrozole RS— Do not dry.

USP Letrozole Related Compound A RS [4,4¢-(1H-1,3,4-triazol-1-ylmethylene)dibenzonitrile] (C17H11N5

285.31) —Do not dry.

USPL-Leucine RS— Do not dry before using.Keep container tightly closed.

USP Leucovorin Calcium RS— [NOTE—This material is extremely hygroscopic.]Do not dry;determine the water content titrimetrically at time of use for quantitative analyses.Keep container tightly closed.Protect from light.

USP Levamisole Hydrochloride RS— Do not dry.Keep container tightly closed.Protect from light.

USP Levmetamfetamine RS— Do not dry before using.Keep container tightly closed and protected from light.

USP Levobunolol Hydrochloride RS— Dry portion in vacuum over phosphorus pentoxide in a suitable drying tube at 110

for 4hours before using.Keep container tightly closed and protected from light.

USP Levocarnitine RS— For quantitative use,determine the water content titrimetrically at the time of use.For IRidentification use,dry portion at 50

in vacuum for 5hours.Keep container tightly closed.This material is extremely hygroscopic.

USP Levocarnitine Related Compound A RS [2-propen-1-aminium,3-carboxy-N,N,N-trimethyl-,chloride] (C7H14ClNO2

179.65) —Do not dry.Keep container tightly closed.Store in a dry place.

USP Levodopa RS— Dry portion at 105

for 4hours before using.Keep container tightly closed.Protect from light.Store in a dry place and prevent exposure to excessive heat.

USP Levodopa Related Compound A RS [3-(3,4,6-trihydroxyphenyl)alanine] (C9H11NO5

213.19) —Do not dry.Keep container tightly closed and protected from light.Store in a cool,dry place.

USP Levodopa Related Compound B RS [3-methoxytyrosine] (C10H13NO4

211.22)— Do not dry.Keep container tightly closed.Protect from light.Store in a cool,dry place.

USP Levonordefrin RS— Dry portion in vacuum at 60

for 15hours before using.Keep container tightly closed.

USP Levorphanol Tartrate RS— This is the dihydrate form.Do not dry;determine the water content titrimetically at the time of use.Keep container tightly closed.

USP Levothyroxine RS— Use without drying;correct for moisture,determined by drying a separate portion in vacuum at 60

for 4hours.Keep container tightly closed and protected from light.

USP Lidocaine RS— Dry portion in vacuum over silica gel for 24hours before using.Keep container tightly closed.

USP Lincomycin Hydrochloride RS— Do not dry.This is the monohydrate form of lincomycin hydrochloride.Keep container tightly closed.Protect from light.Store in a cold place.

USP Lindane RS— Do not dry.Keep container tightly closed.

USP Liothyronine RS— Do not dry before using.Keep container tightly closed.Protect from light.

USP Alpha Lipoic Acid RS.

USP Lisinopril RS— This material is the dihydrate form of Lisinopril.Do not dry;determine the water content titrimetrically at time of use for quantitative analyses.Keep container tightly closed.

USP Lithium Carbonate RS— Dry portion at 200

for 4hours before using.Keep container tightly closed.Store in a cool place.

USP Loperamide Hydrochloride RS— Dry portion in vacuum at 80

for 4hours before using.Keep container tightly closed.

USP Loracarbef RS— Do not dry before using.Keep container tightly closed,protected from light,and store in a cold place.

USP Loracarbef L-Isomer RS— Do not dry before using.Keep container tightly closed,protected from light,and store in a cold place.

USP Loratadine RS— Do not dry.Keep container tightly closed.Protect from light.

USP Lorazepam RS— Do not dry.Keep container tightly closed.Protect from light.

USP Lorazepam Related Compound A RS [7-chloro-5-(o-chlorophenyl)-1,3-dihydro-3-acetoxy-2H-1,4-benzodiazepin-2-one] (C17H12Cl2N2O3

363.20) —Do not dry.Keep container tightly closed and protected from light.

USP Lorazepam Related Compound B RS [2-amino-2¢,5-dichlorobenzophenone] (C13H9ClNO

266.13) —Do not dry before using.Keep container tightly closed and protected from light.

USP Lorazepam Related Compound C RS [6-chloro-4-(o-chlorophenyl)-2-quinazolinecarboxaldehyde] (C15H8Cl2N2O

303.15) —Do not dry before using.Keep container tightly closed.Protect from light.

USP Lorazepam Related Compound D RS [6-chloro-4-(o-chlorophenyl)-2-quinazolinecarboxylic acid] (C15H8Cl2N2O2

319.15) —Do not dry before using.Keep container tightly closed.Protect from light.

USP Lorazepam Related Compound E RS [6-chloro-4-(o-chlorophenyl)-2-quinazoline methanol] (C15H10Cl2N2O

305.16) —Do not dry before using.Keep container tightly closed.Protect from light.

USP Lovastatin RS— Do not dry;use as is.Keep container tightly closed,and store in a freezer under nitrogen.

USP Lovastatin Related Compound A RS [dihydro-lovastatin][butanoic acid,2-methyl-,1,2,3,4,4a,7,8,8a-octahydro-3,7-dimethyl-8-[2(tetrahydro-4-hydroxy-6-oxo-2H-pyran-2-yl)-ethyl]-1-naphthalenyl ester,[1S-[1a(R*),3a,7b,8b(2S*,4S*),-8ab]]-] (C24H38O5

406.56) —Do not dry.This material is hygroscopic.Keep container tightly closed.Protect from light.Store in a refrigerator.

USP Loxapine Succinate RS— Dry portion at 105

for 4hours before using.Keep container tightly closed.

USP Lutein RS— Do not dry.Keep container tightly closed,and store under nitrogen in a cool place.Protect from light.

USPL-Lysine Acetate RS— Do not dry.Keep container tightly closed.

USPL-Lysine Hydrochloride RS— Dry portion at 105

for 3hours before using.This is the monohydrochloride form.Keep container tightly closed.