52). 1-(1-(4-Chlorophenyl) cyclobutyl)-3-methylbutan-1-amine fumarate

53). 4-Nitro-1-methyl-3n-propyl pyrazole-5-carboxamide (Sildenafil Amide)

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54). 4-Amino-1-methyl-3n-propylpyrazole-5-carboxamide (Sildenafil Amine)

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55). 4-[(2-Ethoxyphenyl) carbonylamino]-1-methyl-3n-propylpyrazole-5-carboxamide (Sildenafil Coupled)

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56). 5-(2-Ethoxyphenyl)-1-methyl-3n-propyl-6-hydropyrazolo[4,5-d]pyrimidine-7-one (Sildenafil cyclised)

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57). 5-(5-Chlorosulfonyl-2-ethoxyphenyl)-1-methyl-3n-propyl-1,6-dihydro-7H-pyrazolo-[4,3-d]-pyrimidin-7-one (Sildenafil chlorosulfonyl)

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58). 5-{2-Ethoxy-5-[(4-methylpiperazinyl)sulfonyl]phenyl}-1-methyl-3n-propyl-6-hydropyrazolo[4,5d]pyrimidine-7-one [Sildenafil]

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59). (3-(2-Aminoethyl)-1H-indol-5-yl)-N-methyl methanesulfonamide (Suma Amine)

60). Benzyl (2S)-2-amino-3-methyl butanoate (L-valine benzyl ester)

61). L-valine methyl ester HCl

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63). 3-Methyl-2-(N-((2'-(2-trityl-2,5-dihydro-1H-tetrazol-5-yl)biphenyl-4-yl)methyl)pentanamido)butanoic acid (Trityl valsartan)

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64). (S)-Methyl 2-((2'-cyanobiphenyl-4-yl)methylamino)-3-methylbutanoate

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65). (S)-Methyl 2-(N-((2'-cyanobiphenyl-4-yl)methyl)pentanamido) -3-methylbutanoate

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