Sildenafil impurity A

Synonym(s):

5-[2-Ethoxy-5[(4-methylpiperazin-1-yl)sulfonyl]phenyl]-1-methyl-3-(2-methylpropyl)-6,7-dihydro-1H-pyrazol[4,3-d]pyrimidin-7-one, Isobutyl sildenafil

Empirical Formula (Hill Notation):

C₂₃H₃₂N₆O₄S

CAS Number:

Molecular Weight:

488.60

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pharmaceutical primary standard (1)

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