丙氨酸

alanine (Ala), an amino acid

sour / tart / sick at heart / grieved / sore / aching / pedantic / impractical / to make sarcastic remarks about sb / an acid

third of the ten Heavenly Stems 十天干[shi2 tian1 gan1] / third in order / letter "C" or Roman "III" in list "A, B, C", or "I, II, III" etc / ancient Chinese compass point: 165° / propyl

ammonia

phenylalanine (Phe), an essential amino acid