definiens: means ( a ) in the Research Field, an irreversible orally active pan - caspase inhibitor formerly known as IDN-6556, PF-03491390 ; with an IUPAC name of ( 3S)-3-{[(2S)-2-{[2-(2 - tert - butylanilino)-2 - oxoacetyl]amino}propanoyl]amino}-4- oxo-5-(2,3,5,6 - tetrafluorophenoxy)pentanoic acid ; a nd ( b ) in the Commercial Field, an irreversible orally active pan - caspase inhibitor formerly known as IDN -6556, PF-03491390 ; with an IUPAC name of ( 3S)-3-{[(2S)-2- { [ 2-(2 - tert - butylanilino)-2 - oxoacetyl]amino}propanoyl]amino}-4 - oxo-5-(2,3,5,6 - t etrafluorophenoxy)pentanoic acid, alone or in any d osage form or delivery system, including pro - drugs, hydra tes, hemihydrates, polymorphs, acids, bases, analog s, homologs, derivatives, and isomers, including stere oisomers, structural and geometric isomers, diaster eomers, enantiomers, racemic mixtures, and chiral versions