Letrozole is also used to help prevent the cancer from returning. Some breast cancers are made to grow faster by a natural hormone called estrogen. It is sold under the brand name Femara. Reference standards of Letrozole API,and its pharmacopeial, non pharmacopeial impurities, and stable isotopes are listed below.
Letrozole
Catalogue No.:PA 12 53000
CAS :
Molecular Formula : C17H11N5
Molecular Weight : 285.30
4,4'-(4H-1,2,4-Triazol-4-ylmethylene)dibenzonitrile
Catalogue No.:PA 12 53010
4,4',4''-Methanetriyltribenzonitrile
Catalogue No.:PA 12 53020
Molecular Formula : C22H13N3
Molecular Weight : 319.36
4,4'-Dicyanobenzophenone
Catalogue No.:PA 12 53510
Molecular Formula : C15H8N2O
Molecular Weight : 232.24
4-Descyano-4-bromo-letrozole
Catalogue No.:PA 12 53520
Molecular Formula : C16H11BrN4
Molecular Weight : 339.19
4-((2H-1,2,3-Triazol-2-yl)methyl)benzonitrile
Catalogue No.:PA 12 53530
Molecular Formula : C10H8N4
Molecular Weight : 184.2
Letrozole-d4 (major)
Catalogue No.:PA STI 056360
Molecular Formula : C17H7D4N5
Molecular Weight : 289.33
4-((4-Cyanophenyl)(1H-1,2,4-triazol-1-yl)methyl)benzoic Acid
Catalogue No.:PA 12 53540
Molecular Formula : C17H12N4O2
Molecular Weight : 304.31
4,4'-((1H-1,2,4-Triazol-1-yl)methylene)dibenzoic Acid
Catalogue No.:PA 12 53550
Molecular Formula : C17H13N3O4
Molecular Weight : 323.31
Letrozole N-Oxide 1
Catalogue No.:PA 12 53560
Molecular Formula : C17H11N5O
Molecular Weight : 301.31
Letrozole N-Oxide
Catalogue No.:PA 12 53570
Letrozole (Y0000685)
Catalogue No.:PA EPY0000685
Molecular Formula : NA
Molecular Weight : NA
Letrozole (1356971)
Catalogue No.:PA USP1356971
Letrozole Related Compound A (4,4'-(1H-1,3,4-triazol-1-ylmethylene)dibenzonitrile) (1356982)
Catalogue No.:PA USP1356982
4-(4-Cyanobenzyl)-1,2,4-triazole
Catalogue No.:PA 12 0531000
4,4'-((1H-1,2,4-Triazol-1-yl)methylene)dibenzamide
Catalogue No.:PA 12 0531001
Molecular Formula : C17H15N5O2
Molecular Weight : 321.34
Tris(4-cyanophenyl)methanol
Catalogue No.:PA 12 0531002
Molecular Formula : C22H13N3O
Molecular Weight : 335.37
Letrozole (IPRS/12/18) -from IPC
Catalogue No.:PA IPRS 12 18
Letrozole Mono-Amide Impurity
Catalogue No.:PA 12 0531003
Molecular Formula : C17H13N5O
Molecular Weight : 303.33
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