Examinations were made on the leaves, tree bark, and wood, treated separately, of Formosan Cryptocarya chinensis HEMSL. (Lauraceae) (Japanese name "Maruba-damo": Chinese name "Hou-Kou-kuei") and the bases listed in Table I were isolated in crystalline form. Base B (crychine) was obtained as its picrate of yellow prisms, m.p. 177° (sint. 162°). C₁₉H₁₇O₄N • C₆H₃O₇N, The free base, [α]D¹⁵ -220.2° (EtOH), UV: λmax^EtOH 296.7 mμ. Its NMR spectrum (Fig. 1) indicated that it is a pavine-type new base possessing 4 aromatic protons, 2 methylenedioxy groups, and 1 N-methyl group. Treatment of crychine (K) with phosphorous pentachloride gave an O-methyl compound (XII) through a phenolic base (X). Base D (caryachine) occurs as colorless needles, m.p. 174~175°, [α]D²¹ -269.6° (EtOH), C₁₉H₁₉O₄N. From its NMR spectrum (Fig. 2), this base was found to possess 4 aromatic protons, 1 methylenedioxy group, 1 methoxyl, and 1 N-methyl group; UV: λmax^EtOH 291.5 mμ. The O-methylated compound of the phenolic base (XIII) obtained by cleavage of methylenedioxy group in O-methylcaryachine with phosphorous pentachloride was found to agree with N-methylpavine (argemonine) (X) derived from papaverine (XIV). In other words, the structure of caryachine can be represented by formula (XVI). On the other hand, O-methylcaryachine agreed with the O-methyl compound of the phenolic base derived from crychine (K) and it follows that the structure of crychine would be 13-methyl-2,3:8,9-dimethylenedioxy-5,6,11,12-tetrahydro-5,11-dibenzo[a,e]cyclooctene (K). Base E, m.p. 241~242°, was identified as dl-caryachine. (Received May 28, 1965)