From the stem bark of Monanthotaxis buchananii five oxygenated cyclohexane epoxide derivatives have been isolated, four of which are novel. One was identified as the 2-methyl ether of (+)-pipoxide and a second as labenzoyloxymethyl-3cc-benzoyloxycyclohex-5-en-1~,2~,4~-triol, probably derived from opening of the epoxide ring of a pipoxide precursor. The remaining three compounds are all diepoxides. Two, monanthadiepoxide methyl ether and boesenboxide have diequatorial substituents at C-2 and C-3 with stereochemistry comparable to crotepoxide while the third, epimonanthadiepoxide, has diaxial substituents at C-2 and C-3.