methyl 2-[(4-toluenesulfonyl)amino]-4-pentynoate
2-(2,6-Dichloro-benzoylamino)-pent-4-ynoic acid methyl ester
methyl 2-{[4'-methoxy(1,1'-biphenyl)-4-yl]sulfonyl}amino-6-(4N-acetylpiperazin-1N-yl)hex-4-ynoate
methyl 2-{[4'-thiomethoxy(1,1'-biphenyl)-4-yl]sulfonyl}amino-5-phenylpent-4-ynoate
(+/-)-methyl 2-(4-iodobenzenesulfonylamino)-5-phenylpent-4-ynoate