(+-)-2-Amino-N-(1-methyl-1,2-diphenylethyl)acetamide fumarate 136286-29-8 Acetamide, 2-amino-N-(1-methyl-1,2-diphenylethyl)-, (+-)-, (E)-2-butenedioate FPL 12924 fumarate PR934-423 Remacemide fumarate