TraMadol EP IMpurity-C;Tramadol Impurity 2;KTYGAWYKBWMJNI-UHFFFAOYSA-N;Tramadol EP Impurity C HCl;1-[2-(3-methoxyphenyl)cyclohex-2-en-1-yl]-N,N-dimethylmethanamine;Tramadol Impurity 3(Tramadol EP Impurity C);Tramadol imp C;Tramadol EP Impurity C Hydrochloride