(R-)-3-isobutyl GABA 148553-50-8 3-isobutyl GABA CI 1008 CI-1008 Hexanoic acid, 3-(aminomethyl)-5-methyl-, (3S)- Hexanoic acid, 3-(aminomethyl)-5-methyl-, (S)- Lyrica PD 144723 Pregabalin Pregabalin [USAN]