70766-47-1 Bicyclo(2.2.1)hept-5-en-2-ylmethyl dimethyl phosphite EINECS 274-851-3 Phosphorous acid, bicyclo(2.2.1)hept-5-en-2-ylmethyl dimethyl ester Phosphorous acid, dimethyl 5-norbornen-2-ylmethyl ester