pel·ta·tin | \ pel-ˈtāt-ᵊn 
\
\Medical Definition of 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
\ : one C21H20O8 containing two hydroxyl groupsb or β-peltatin \ ˈbāt-ə-, chiefly British ˈbēt-ə- \ : one C22H22O8 containing only one hydroxyl group with the other replaced by a methoxyl group
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