4177 Urushiol III Urushiol is an oily organic allergen found in plants of the family Anacardiaceae, especially Toxicodendron spp.(e.g., poison oak, poison ivy, poison sumac) and also in mangos. In sensitive individuals, urushiol can cause an allergic skin rash on contact, known as urushiol-induced contact dermatitis. The name comes from the Japanese word for the tree Toxicodendron vernicifluum 492-91-1 5281862 C21H32O2 White powder. No indication of carcinogenicity to humans (not listed by IARC). Urushiol is an oily organic allergen found in plants of the family Anacardiaceae, especially Toxicodendron spp. 2014-08-29T05:21:27Z 2026-05-21T01:37:32Z C10839 true [H]\C(CCC)=C(\[H])C\C([H])=C(/[H])CCCCCCCC1=C(O)C(O)=CC=C1 C21H32O2 InChI=1S/C21H32O2/c1-2-3-4-5-6-7-8-9-10-11-12-13-14-16-19-17-15-18-20(22)21(19)23/h4-5,7-8,15,17-18,22-23H,2-3,6,9-14,16H2,1H3/b5-4+,8-7+ RMTXUPIIESNLPW-AOSYACOCSA-N 316.4776 316.240230268 Exogenous Solid 4445156 CHEM003083 DTXSID701262103 NS00094546 40.46 101.70819999999999 39.047678040696255 12 2 2 9.548682588012245 -6.279935694327706 0 1 7.70 -5.68 6.60e-04 g/l