hydroxy-16 dehydro-1 vincadifformine

(4S)-N-[2-(indol-3-yl)-ethyl]-4-ethyl-4-hydroxymethyl-6-hydroxyhexamide

(4S)-N-[2-(3-indolyl)-ethyl]-4-ethyl-4-hydroxymethyl-6-tert-butyldiphenylsiloxyhexamide

(4S)-4-ethyl-4-(3-hydroxypropyl)dihydro-2(3H)-furanone

(4S)-4-ethyl-4-[2-(hydroxycarbonyl)ethyl]dihydro-2(3H)-furanone