178182-49-5 Heliquinomycin NSC 702208 Spiro(benzo(1,2-b:5,4-c')dipyran-2(3H),2'(3'H)-naphtho(2,3-b)furan)-7-carboxylic acid, 4,5',8',9-tetrahydro-3'-((2,6-dideoxy-3-O-methylhexopyranosyl)oxy)-7'-methoxy-3,4',9',10-tetrahydroxy-5',8',9-trioxo-, methyl ester