definiens: means the serotonin ( 5 - HT2 ) receptor antagonist S - MPEC ( ifera nserin ( INN ) = ( E)-2 ' -{2-[(2S)-l - meth yl-2 - piperidyl]ethyl } cinnamanilide serotonin receptor antagonist C23H28N2O, CAS 58754 - 46 - 4 ) . The definition includes all its various chemical forms, includin g deriv atives acids, bases, esters, salts, isomers, enantiomers, pro - drug forms, metabolite s, hy drate s, solvates, polymorph s and degradant s thereof in crystal, powder or other form and improvement s, including new formulations and combinations and in addition, any back - up compounds to be provided by Sam Amer