InChI=1/C19H26O7/c1-12-6-5-7-18(11-24-14(3)21)16(25-18)9-19(8-15(12)22)17(4,26-19)10-23-13(2)20/h6,16H,5,7-11H2,1-4H3/b12-6+/t16-,17-,18-,19-/m1/s Sipaucin A [(1R,3S,3'R,6E,10R)-3',6-dimethyl-5-oxo-10H-spiro[11-oxabicyclo[8.1.0]undec-6-ene-3,2'-oxirane]-3',10-diyl]bis(methylene) reldi-acetate spiro[11-oxabicyclo[8.1.0]undec-6-ene-3,2'-oxiran]-5-one, 3',10-bis[(acetyloxy)methyl]-3',6-dimethyl-, (1R,3S,3'R,6E,10R)-