吡嗪 [－－]

Jyutping bei2 ceon4
Pinyin bì qín

Definitions (Wiktionary)
  1. noun
    pyrazine

吡嗪 [－－]

Jyutping
Pinyin bǐ qín

Definitions (CC-CEDICT)
  1. pyrazine (chemistry) (loanword)