Erythroxylum macrocarpum and E. sideroxyloides, two closely related species indigenous to Mauritius, contain a similar range of alkaloids consisting mainly of benzoyl esters of tropan-3α-ol, tropan-3β-ol, and tropan-3α,6β-diol together with their nor-derivatives. 3α-Benzoyloxytropan-6β-ol (E. sideroxyloides) and 3α-benzoyloxynortropane and 3β-benzoyloxynortropan-6β-ol (both species) are reported for the first time. © 1986.