has functional parent carotenol carotenone spirilloxanthin carotenoid ether ketone hydrate 2',2'-dihydroxy-2-oxospirilloxanthin (3E,3'E)-2',2'-dihydroxy-1,1'-dimethoxy-3,3',4,4'-tetradehydro-1,1',2,2'-tetrahydro-psi,psi-caroten-2-one 2',2'-dihydroxy-2-oxospirilloxanthin 642.428 642.908 A carotenoid ether that is spirilloxanthin carrying an oxo group at position 2 as well as two hydroxy group, both at position 2'. C(=C(/C=C/C(C(OC)(C)C)(O)O)\C)\C=C\C(=C\C=C\C(=C\C=C\C=C(\C=C\C=C(\C=C\C=C(\C=C\C(C(OC)(C)C)=O)/C)/C)/C)\C)\C C42H58O5 CHEBI:91230 InChI=1S/C42H58O5/c1-33(21-15-23-35(3)25-17-27-37(5)29-30-39(43)40(7,8)46-11)19-13-14-20-34(2)22-16-24-36(4)26-18-28-38(6)31-32-42(44,45)41(9,10)47-12/h13-32,44-45H,1-12H3/b14-13+,21-15+,22-16+,25-17+,26-18+,30-29+,32-31+,33-19+,34-20+,35-23+,36-24+,37-27+,38-28+ MetaCyc:CPD-16864 PMHQKXGSEPQTLQ-MRPVJXBNSA-N chebi_ontology