英文别名N-BOC-N-DESETHYL ACETILDENAFIL; 2-Methyl-2-propanyl 4-{2-[4-ethoxy-3-(1-methyl-7-oxo-3-propyl-4,7-dihydro-1H-pyrazolo[4,3-d]pyrimidin-5-yl)phenyl]-2-oxoethyl}-1-piperazinecarboxylate; 1-Piperazinecarboxylic acid, 4-[2-[3-(4,7-dihydro-1-methyl-7-oxo-3-propyl-1H-pyrazolo[4,3-d]pyrimidin-5-yl)-4-ethoxyphenyl]-2-oxoethyl]-, 1,1-dimethylethyl ester; Acetildenafil-N-Boc-N-desethyl; tert-butyl 4-[2-[4-ethoxy-3-(1-methyl-7-oxo-3-propyl-6H-pyrazolo[4,3-d]pyrimidin-5-yl)phenyl]-2-oxoethyl]piperazine-1-carboxylate; 1-Piperazinecarboxylic acid, 4-(2-(3-(6,7-dihydro-1-methyl-7-oxo-3-propyl-1H-pyrazolo(4,3-d)pyrimidin-5-yl)-4-ethoxyphenyl)-2-oxoethyl)-, 1,1-dimethylethyl ester; tert-Butyl 4-(2-(4-ethoxy-3-(1-methyl-7-oxo-3-propyl-6,7-dihydro-1H-pyrazolo[4,3-d]pyrimidin-5-yl)phenyl)-2-oxoethyl)piperazine-1-carboxylate; 4-[2-[3-(6,7-Dihydro-1-methyl-7-oxo-3-propyl-1H-pyrazolo[4,3-d]pyrimidin-5-yl)-4-ethoxyphenyl]-2-oxoethyl]-1-piperazinecarboxylic acid 1,1-dimethylethyl ester; Sildenafil Impurity 276; Sildenafil Impurity 72; 1,1-Dimethylethyl 4-[2-[3-(6,7-dihydro-1-methyl-7-oxo-3-propyl-1H-pyrazolo[4,3-d]pyrimidin-5-yl)-4-ethoxyphenyl]-2-oxoethyl]-1-piperazinecarboxylate; Apremilast Impurity 104 
