definiens: means DIFICID ( fidaxomicin ) tablets, or other pharmaceutical product ( including, withoutlimitation, in oral suspension formulation, together with any improvements thereto, such as different dosages, dispersions, MUPS tablets, once daily and sustained release ), containing the chemical Oxacyclooctadeca-3,5,9,13,15 - pentaen-2 - one, 3-[[[6 - deoxy-4 - O-(3,5 - dichloro-2 - ethyl-4,6 - dihydroxybenzoyl)-2 - O - methyl - ß - D - mannopyranosyl]oxy]methyl]-12-[[6 - deoxy-5 - C - methyl-4 - O-(2 - methyl-1 - oxopropyl)-ß - D - lyxo - hexopyranosyl]oxy]-11 - ethyl-8 - hydroxy-18-[(1R)-1 - hydroxyethyl]-9,13,15 - trimethyl-, ( 3E,5E,8S,9E,11S,12R,13E,15E,18S)- or any salt, hydrate, solvate, polymorph, stereo - isomer, ester, chelate, clathrate, acid, base, epimer, enantiomer, crystalline form, metabolite or prodrug or any other non - covalent derivative orcrystalline form thereof