(4R,5S,8S,9S,12R,13R)-5:8,9:12-dioxido-13-tert-butyldimethylsilyloxy-tricosan-1,4-olide

(5R,6S,9S,1OS,13R,14R)-5-hydroxy-6:9,10:13-dioxido-14-tert-butyldimethylsilyloxy-tetracos-1-ene

(2S,2'S,5'S,2''S,5''S)-5''-((R)-4-Benzyloxy-1-hydroxy-butyl)-hexahydro-[2,2';5',2'']terfuran-5-one

(2S,2'S,5'S,2''S,5''R)-5''-((S)-4-Benzyloxy-1-hydroxy-butyl)-hexahydro-[2,2';5',2'']terfuran-5-one

(2S,2'R,5'S,2''S,5''R)-5''-((R)-4-Benzyloxy-1-hydroxy-butyl)-hexahydro-[2,2';5',2'']terfuran-5-one