This work describes the antinociceptive effect of a triterpene glycoside, n
iga-ichigoside F-1 (1), obtained from an EtOAc extract of the aerial parts
of Rubus imperialis. When evaluated against an HOAc-induced writhing model,
it exhibited an ID50 value of 3.1 mg/kg (ip). Moreover, in a formalin-indu
ced pain model, both phases of pain were inhibited by compound 1, with ID50
values of 2.6 (first phase) and 2.7 (second phase) mg/kg, (ip), respective
ly.