Haplotubinone InChI=1/C19H23NO4/c1-11(2)9-10-13(18(3,4)23)16-19(24-16)15(21)12-7-5-6-8-14(12)20-17(19)22/h5-9,13,16,23H,10H2,1-4H3,(H,20,22)/t13-,16+,19-/m1/s rel-(2R,3R)-3-[(1S)-1-(1-hydroxy-1-methylethyl)-4-methylpent-3-en-1-yl]-2'H-spiro[oxirane-2,3'-quinoline]-2',4'(1'H)-dione spiro[oxirane-2,3'(2'H)-quinoline]-2',4'(1'H)-dione, 3-[(1R)-1-(1-hydroxy-1-methylethyl)-4-methyl-3-pentenyl]-, (2S,3S)-