From the seeds ofCarica pappya a substance, m.p. 165° (C8H10N2S) has been isolated for the first time and named ‘Carpasemine’ to indicate its source. The chemical properties of ‘Carpasemine’ together with its degradation products have been studied and some new derivatives have been prepared from it. ‘Carpasemine’ has been identified to be benzylthiourea or benzylthiocarbamide by mixed melting point with the synthetically prepared benzylthiourea. The identity has also been confirmed through the mixed melting point of their derivatives.