(R)-2-((2R,4aR,7R,8aR)-4,4,7-trimethylhexahydro-4H-benzo[e][1,3]oxathiin-2-yl)but-3-en-2-ol

(R)-(+)-2-methyl-2-hydroxy-3-buten-1-yl p-toluenesulfonate

sodium mevalonate

(2'R,3aR,5R,6aR)-5-((R)-2,2-dimethyl-1,3-dioxolan-4-yl)-2,2,4'-trimethyl-5,6a-dihydro-3aH-spiro[furo[2,3-d][1,3]dioxole-6,2'-pyran]-6'(3'H)-one

(1S,3R,3a'R,5'R,6S,6a'R)-5'-((R)-2,2-dimethyl-1,3-dioxolan-4-yl)-1,2',2'-trimethyldihydro-5'H-4,7-dioxaspiro[bicyclo[4.1.0]heptane-3,6'-furo[2,3-d][1,3]dioxol]-5-one