28-O-Formyl Rapamycin (>80%)

CO[C@@H]1CC(C[C@@H](C)[C@@H]2CC(=O)[C@H](C)\C=C(/C)\[C@@H](OC=O)[C@@H](OC)C(=O)[C@H](C)C[C@H](C)\C=C\C=C\C=C(/C)\[C@H](C[C@@H]3CC[C@@H](C)[C@@](O)(O3)C(=O)C(=O)N4CCCC[C@H]4C(=O)O2)OC)CC[C@H]1O

InChI=1S/C52H79NO14/c1-31-16-12-11-13-17-32(2)43(62-8)28-39-21-19-37(7)52(61,67-39)49(58)50(59)53-23-15-14-18-40(53)51(60)66-44(34(4)26-38-20-22-41(55)45(27-38)63-9)29-42(56)33(3)25-36(6)47(65-30-54)48(64-10)46(57)35(5)24-31/h11-13,16-17,25,30-31,33-35,37-41,43-45,47-48,55,61H,14-15,18-24,26-29H2,1-10H3/b13-11+,16-12+,32-17+,36-25+/t31-,33?,34-,35-,37-,38?,39+,40+,41-,43+,44+,45-,47-,48+,52-/m1/s1

IUPAC name: [(1R,9S,12S,15R,16E,18R,19R,21R,23S,24E,26E,28E,30S,32S,35R)-1-hydroxy-12-[(2R)-1-[(3R,4R)-4-hydroxy-3-methoxycyclohexyl]propan-2-yl]-19,30-dimethoxy-15,17,21,23,29,35-hexamethyl-2,3,10,14,20-pentaoxo-11,36-dioxa-4-azatricyclo[30.3.1.04,9]hexatriaconta-16,24,26,28-tetraen-18-yl] formate