2-benzyl-N'-[2-[benzyl(methyl)amino]ethyl]-N-[(2S)-1-[[(3R)-1-cyclohexyl-3,4-dihydroxy-6-methylheptan-2-yl]amino]-1-oxopent-4-yn-2-yl]-N'-methylbutanediamide;2-benzyl-N-[(2S)-1-[[(3R)-1-cyclohexyl-5-cyclopropyl-3,4-dihydroxypentan-2-yl]amino]-1-oxopent-4-yn-2-yl]-N'-[2-(dimethylamino)ethyl]-N'-methylbutanediamide;2-benzyl-N-[(2S)-1-[[(3R)-1-cyclohexyl-5-cyclopropyl-3,4-dihydroxypentan-2-yl]amino]-1-oxopent-4-yn-2-yl]-N'-[2-[ethyl(methyl)amino]ethyl]-N'-methylbutanediamide;2-benzyl-N-[(2S)-1-[[(3R)-1-cyclohexyl-3,4-dihydroxy-6-methylheptan-2-yl]amino]-1-oxopent-4-yn-2-yl]-N'-[2-(diethylamino)ethyl]-N'-methylbutanediamide;2-benzyl-N-[(2S)-1-[[(3R)-1-cyclohexyl-3,4-dihydroxy-6-methylheptan-2-yl]amino]-1-oxopent-4-yn-2-yl]-N'-[2-(dimethylamino)ethyl]-N'-methylbutanediamide;2-benzyl-N-[(2S)-1-[[(3R)-1-cyclohexyl-3,4-dihydroxy-6-methylheptan-2-yl]amino]-1-oxopent-4-yn-2-yl]-N'-[2-[ethyl(methyl)amino]ethyl]-N'-methylbutanediamide