種子含脂肪油48%-50%,油中含多種脂肪酸,主要有油酸(oleic acid)89.2%,棕櫚酸(palmitic acid)5.5%,亞麻油酸(linoleic acid)0.4%,亞麻酸(linolenic acid)0.3%等,油中還含菜油固醇(campesterol),豆固醇(stigmasterol),β-谷固醇(β-sitosterol),△7-豆固醇(△7-stigmasterol),6,20-環氧千金藤醇-5,15-二乙酸-3-苯乙酸酯即酯L1(6,20-epoxylathyrol-5,15-DIACetate-3-phenylacetate,Ester L1),曾命名為千金子固醇(eu- phorbia storoid),巨大戟萜醇-20-棕櫚酸酯(ingenol-20-he-xadecanoate),7-羥基-千金藤醇-二乙酸-二苯甲酸酯即酯L2(7-hydroxylathyroldiacetate-dibenzoate, Ester L2),巨大戟萜醇-1-H-3,4,5,8,9,13,14-七去氫-3-十四酸酯(ingenol-1-H-3,4,5, 8,9,13,14-hepta-dehydro-3-tetradecanoate)、千金藤醇-3,15-二乙酸-5-苯甲酸酯即酯L3(lathyrol-3,15-diacetate-5-benzoate, EsterL3)、千金藤醇-3,15-二乙酸-5-菸酸酯即酯L8(lathyrol-3,15-di-acetate-5-nicotinate,Ester L8),巨大戟萜醇-3-棕櫚酸酯即酯L5(ingenol-3-hexadecanoate,Ester L5),17-羥基岩大戟-15,17-二乙酸-3-O-桂皮酸酯即酯L7a(17-hydroxyjolkinol-15,17-diacetate-
3-O-cinnamate,Ester L7a),17-羥基-異千金藤醇-5,15,17-三-O-乙酸-3-O-苯甲酸酯即酯L7b(17-hydroxyisolathyrol-5,15 ,17-tri-O-acetate-3-O-benzoate,EsterL7b), 7-羥基千金藤醇-5,15-二乙酸-13-苯甲酸酸-7-菸酸酯即酯L9(7-hydroxylathyrol -5,15-diac-etate-3-benzoate-7-nicostinate,Ester L9)及三十一烷(hentriacontane)等。
種子還含瑞香素(daphnetin),馬栗樹皮甙(esculetin),千金子素(euphorbetin)及異千金子素(isoeuphorbetin)。