Synonyms: 21-Nor-16,17-secodammara-22,24-dien-16-oicacid, 3-[[6-O-(6-deoxy-a-L-mannopyranosyl)-b-D-glucopyranosyl]oxy]-30-hydroxy-17-methyl-20-oxo-, g-lactone, (3b,22E)-; Spiro[furan-3(2H),1'(2'H)-phenanthren]-5(4H)-one,7'-[[6-O-(6-deoxy-a-L-mannopyranosyl)-b-D-glucopyranosyl]oxy]-2'-[(3E)-1,6-dimethyl-2-oxo-3,5-heptadienyl]dodecahydro-4'b,8',8',10'a-tetramethyl-,(1'S,2'R,4'aR,4'bR,7'S,8'aR,10'aR)- (9CI); Spiro[furan-3(2H),1'(2'H)-phenanthrene],21-nor-16,17-secodammara-22,24-dien-16-oic acid deriv.; Gouanoside A;Spiro[furan-3(2H),1'(2'H)-phenanthrene]-5(4H)-one, 7'-[[6-O-(6-deoxy-a-L-mannopyranosyl)-b-D-glucopyranosyl]oxy]-2'-[(3E)-1,6-dimethyl-2-oxo-3,5-heptadienyl]dodecahydro-4'b,8',8',10'a-tetramethyl-,(1'S,2'R,4'aR,4'bR,7'S,8'aR,10'aR)-