1alpha-Methoxycephalostatin 1 211050-18-9 Cephalostatin 18 Dispiro(furan-2(3H),3'-(1H,3H)furo(3'',2'':3',4')cyclopenta(1',2':5,6)naphtho(1,2-b)pyrano(3'',4'':2',3')cyclopenta(1',2':5,6)naphtho(1,2- i)phenazine-15'(24'H),2''(3''H)-furan)-24'-one, ,4',4'',4'a,5,5',5'',6'b,7',8',8'a,9',11',11'a,11'b,12',13',13'a,13'b,14',16'a,17'b,18',19',19'a,20',22',22'a,22'b,23'-triacontahydro-3,3'',13',13'b-tetrahydroxy-5''-(hydroxymethyl)-22'-methoxy- 4',5,5,5'',11'a,13'a,14',22'a-octamethyl-, (2R,2''S,3R,3''R,4'S,4'aR,5''S, 6'bR,8'aS,11'aS,11'bS,13'R,13'aR,13'bS,14'S,16'aS,17'bR,19'aS,22'R,22'aS,22'bS,24'aR)-