(1S,?2S,?5R,?7R,?10S,?11S,?14R,?16R,?19S,?20S,?23R,?25R)?-5,?14-?Diethyl-?2,?11,?20,?23-?tetramethyl-?4,?13,?22,?28,?29,?30-?hexaoxatetracyclo[23?.2.1.17,?10.116,?19]?triacontane-?3,?12,?21-?trione is an antibiotic precursor isolated from Streptomyces globisporus.