(S)-Alanine .alpha.-Alanine .alpha.-Aminopropionic acid 56-41-7 Alanine Alanine, L- L(+)-Alanine L-.alpha.-Alanine L-.alpha.-Aminopropionic acid L-2-Aminopropanoic acid L-2-Aminopropionic acid L-Alanine NSC206315 Propanoic acid, 2-amino- Propanoic acid, 2-amino-, (S)-