Four new tetrahydroisoquinoline-monoterpene glucosides, trans-cephaelo
side, cis-cephaeloside, 6-O-methyl-trans-cephaeloside and 6-O-methyl-c
is-cephaeloside, have been isolated from the roots of Cephaelis ipecac
uanha. Their structures have been elucidated on the basis of chemical
and spectral data.