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Jyutping bun3 gwong1 on1 syun1
Pinyin bàn guāng ān suān

Definitions (CC-CEDICT)
  1. cysteine (Cys), an amino acid
  2. mercaptoethyl amine
Definitions (Wiktionary)
  1. noun, Mainland-China
    cysteine
    (syn.) 半胱胺酸