It differs from pethidine (meperidine) in that the N-methyl group of meperidine is replaced by an N-aminophenethyl group, which increases its analgesic activity.
The chemical structure of this compound varies from that of pethidine (meperidine), featuring an N-aminophenethyl group in place of the N-methyl group of meperidine, which amplifies its analgesic properties.