(cis,4R,5R,12R,13S)-5-tert-butyldiphenylsilyloxytricosa-12,13-isopropylidenedioxy-8-en-1,4-olide

(4R,5R,8R,12R,13S)-12,13-isopropylidenedioxy-5,8-oxidotricosan-1,4-olide

(4R,5R,8R,9S,12R,13S)-9-imidazolylthiocarbonyloxy-12,13-isopropylidenedioxy-5,8-oxidotricosan-1,4-olide