羧 羧 suo1
carboxyl radical (chemistry)

strokes 13
radical
羊
羊
strokes after radical 7
羧基 羧基 suo1 ji1
carboxyl group -COOH

羧基酸 羧基酸 suo1 ji1 suan1
carboxylic acid

羧甲司坦 羧甲司坦 suo1 jia3 si1 tan3
carbocysteine

羧酸 羧酸 suo1 suan1
carboxylic acid