3-Buten-2-one, 4-(2,5,6,6-tetramethyl-1(or 2)-cyclohexen-1-yl)- 4-(2,5,6,6-Tetramethyl-1(or 2)-cyclohexen-1-yl)-3-buten-2-one 54992-91-5 EINECS 259-427-8 Irone