... 24S)-6'-[(S)-sec-butyl]-21,24-dihydroxy-5',11,13,22-tetramethyl-2-oxo-3,7,19-trioxatetracyclo[15. ... 20R,21R,24S)-21,24-dihydroxy-6'-isopropyl-5',11,13,22-tetramethyl-2-oxo-3,7,19-trioxatetracyclo[15. ... 33(61-47)16-15-27(4)42(26(3)13-12-14-32-24-55-45-40(49)29(6)19 ... (60-46)15-14-26(4)42(25(3)12-11-13-31-23-54-44-39(48)28(6)18 ... 15,19-23H2,1-10H3/b13-12+,27-15+,32-14+;12-11+,26-14+,31-13+/t25-,26+,28+,30+,31+, ...