peltatin

: either of two lactones that occur as glycosides in the rootstock of the mayapple (Podophyllum peltatum) and have some antineoplastic activity:

a or α-peltatin \ˈal-fə- \ : one C₂₁H₂₀O₈ containing two hydroxyl groups

b or β-peltatin \ˈbāt-ə-, chiefly British ˈbēt-ə- \ : one C₂₂H₂₂O₈ containing only one hydroxyl group with the other replaced by a methoxyl group