Euscaphis japonica (THUNB.) KANTIZ is a deciduous broad-leaved tree generally found in the fields and mountains of western Japan. In 1971, Ishikura reported on the isolation and structures of three flavonol glycosides and an anthocyanin from the capsules. In addition, four triterpenoic acids were isolated from the ether extract of the pericarps by Takahashi et al. In the course of our investigation with Ehrlich's reagent for detection of the constituents on thin-layer chromatography, we have found some amino acid amides with oxypinnatanine from Hemerocallis fluva var.kwanso (Liliaceae). This paper deals with the isolation and establishment of the structures of two new compounds related to amino acid amides, named euscamine A (1) and B (2), along with three known triterpenoic acids (oleanolic acid, ursolic acid and pomolic acid) from the capsules of E. japonica. Euscamine A (1) was determined to be N-(3'-hydroxymethyl-2',5'-dihydro-2'-furyl)-succinamic acid, and euscamine B (2) was concluded to be N^5-(3'-hydroxymethyl-2',5'-dihydro-2'-furyl)-N^5-methyl-glutamine methyl ester.