Examinations were made on the components of Lycopodium serratum THUNB. var. thunbergii MAKINO (Japanese name Hosoba-Togeshiba) from Mt. Hira in Shiga Prefecture. A new triterpene was isolated from the neutral fraction and named serratenediol, C30H48(OH)2, m.p. 300° (diacetate, m.p. 336-338°, [α]D29+18.8°(c=2.34, CHCl3)), with serratenediol monoacetate, C30H48(OH)OCOCH3, m.p. 319-320°, [α]D10-5.7°(c=1.06, CHCl3). New alkaloids were isolated from the basic fraction and named serratinine, m.p. 244-245°, [α]D8-27.8°(c=1.44, EtOH), C12H17(β-N)(=CH-CH3)(-CH2-CO-)(OH)2, serratine, m.p. 253°, C17H27O3N, and serratanine perchlorate, m.p. 239-241°(decomp.), [α]D12-29.3°(c=0.512, EtOH), C11H19O2N·HClO4. Known alkaloids, lycodoline (‡T) and lycodine (‡U) were also isolated and identified. (Received June 20, 1964); A remarkable antipyretic and analgetic action was observed with various C-methyl-7-aminopyrazolo[1,5-a]pyrimidine derivatives, and thus C-alkyl and C-phenyl substituted 7-aminopyrazolo[1,5-a]pyrimidine and also 3-bromo derivatives were synthesized. The corresponding 7-aminopyrazolo[1,5-a]pyrimidine (XII~XXIV) were prepared from 5-aminopyrazoles by the condensation with β-ketonitriles (I~MI) in the presence of acidic catalysts. Bromination of XII~XXIV proceeded to give 3-bromo derivatives (XXV~XXX), only when C-3 was not occupied. On the other hand, bromination of 5-aminopyrazoles gave 4-bromo derivatives (XXXI~XXXIII), which were condensed with pyrimidine to give 7-aminopyrazolo[1,5-a]pyrimidine and it became clear that bromination was taken place at C-3. (Received June 20, 1964)