<3R*-<3α,4β,5α(1S*)>>-3-hydroxy-4-methyl-5-(1-methyl-2-butynyl)-dihydrofuran-2(3H)-one

<5R*-<1S*,2R*,3S*>>-2,2-bis(trifluoromethyl)-5-(2,3-epoxy-1-methylbutyl)-1,3-dioxolan-4-one