Synonyms: 8,12,45,46,47,48,50-Heptaoxaheptacyclo[39.3.1.11,5.19,13.115,19.125,29.129,33]pentacont-23-ene-7,35-dione,3,37-bis(acetyloxy)-10,14,15,17,27,43-hexahydroxy-11-(4-hydroxy-2-methylene-5,7-octadienyl)-31-methoxy-18,36,38,43,49-pentamethyl-39-methylene-,[1S-[1R*,3R*,5S*,9S*,10S*,11S*(4R*,5E),13S*,14R*,15S*,17R*,18S*,19S*,23Z,25S*,27R*,29R*,31R*,33R*,36R*,37R*,38S*,41R*,43R*,49R*]]-;8,12,45,46,47,48,50-Heptaoxaheptacyclo[39.3.1.11,5.19,13.115,19.125,29.129,33]pentacont-23-ene-7,35-dione,3,37-bis(acetyloxy)-10,14,15,17,27,43-hexahydroxy-11-[(4S,5E)-4-hydroxy-2-methylene-5,7-octadienyl]-31-methoxy-18,36,38,43,49-pentamethyl-39-methylene-,(1S,3S,5R,9R,10R,11R,13R,14S,15R,17S,18R,19R,23Z,25R,27S,29S,31S,33S,36S,37S,38R,41S,43S,49S)-(9CI); (+)-Altohyrtin C; (+)-Spongistatin 2; Altohyrtin C; Spongistatin 2