2-Butenoicacid, 4-[[(5a,6b)-17-(cyclopropylmethyl)-4,5-epoxy-3,14-dihydroxymorphinan-6-yl]amino]-4-oxo-,methyl ester, (E)-; Morphinan, 2-butenoic acid deriv.; b-FNA; b-Funaltrexamine; b-Naltrexamine N-(methyl fumarate)
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