... ,12S,13S,20R,21R,24S)-6'-[(S)-sec-butyl]-21,24-dihydroxy-5',11,13,22-tetramethyl-2-oxo-3,7 ... ,19-trioxatetracyclo[15.6.1.14,8.020,24]pentacosa-10,14,16,22-tetraene-6-spiro-2'-(5 ... 6S,6'R,8R,12S,13S,20R,21R,24S)-21,24-dihydroxy-6'-isopropyl-5',11,13,22-tetramethyl-2-oxo ... )16-15-27(4)42(26(3)13-12-14-32-24-55-45-40(49)29(6)19-35(46(51 ... ,20-24H2,1-10H3;11-14,16-18,24-25,27,29-30,32-44,48-49,51H,15,19-23H2,1 ...