Intermediates of Anti-ED API，sildenafil citrate，vardenafil dihydrochloride

Camasy provides a series of intermediates for the production of Sildenafil Citrate and Vardenafil Hydrochloride (API).4-Amino-1-methyl-3-n-propyl-5-pyrazolecarboxamide（139756-02-8），4-[(2-ethoxybenzoyl)amino]-2-methyl-5-propylpyrazole-3-carboxamide（139756-03-9），5-(2-Ethoxyphenyl)-1-methyl-3-propyl-1,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one（139756-21-1），
4-Ethoxy-3-(1-methyl-7-oxo-3-propyl-6,7-dihydro-1H-pyrazolo[4,3-d]pyrimidin-5-yl)benzenesulfonyl chloride（139756-22-2）.