SDF01: Sildenafil [CAS # 139755-83-2]
SDF02: Sildenafil Citrate [CAS # 171599-83-0]

SDF03: 2-Ethoxy-5-(4-methyl-piperazin-1-yl-sulphonyl)-benzaldehyde

SDF04: 4-Amino-1-methyl-3-propylpyrazole-5-carboxamide [CAS # 139756-02-8]
SDF05: 4-Amino-1-methyl-3-propylpyrazole-5-carboxamide hydrochloride [CAS # 247584-10-7]

SDF06: 2-Ethoxybenzoyl chloride [CAS # 42926-52-3]

SDF07: 5-(2-ethoxyphenyl)-1-methyl-3-propyl-1,6-dihydro-7H-pyrazole[4,3-d]pyrimidine-7-one

SDF08: 5-(5-chlorosulfonyl-2-ethoxyphenyl)-1-methyl-3-propyl-1,6-dihydro-7H-pyrazole[4,3-d]pyrimidine-7-one [CAS # 139756-22-2]

SDF09: N-Desmethyl Sildenafil (metabolite)