(2R,5S,2'S)-5-(2-acetoxy-3-butenyl)-5-(3-butenyl)-2,5-dihydro-3,6-dimethoxy-2-isopropylpyrazine

(3S,9aR)-3-isopropyl-1-methoxy-9a-methyl-3,8,9,9a-tetrahydropyrido[1,2-a]pyrazine-4,7(6H)-dione

(3R,6S)-3-Isopropyl-2,5-dimethoxy-8-vinyl-1,4-diaza-spiro[5.5]undeca-1,4,8-triene

(2'S,5'R)-1-[2-(3-butenyl)-5-isopropyl-3,6-dimethoxy-2,5-dihydropyrazin-2-yl]propan-2-ol

methyl 2-[(tert-butoxycarbonyl)amino]hex-5-enoate