Division 4.10 Tryptophan (C11H12N2O2), phenacetin (C10H7CH2CONH2) or lysine mono- or di-hydrochloride (C6H14N2O2 HCl or C6H14N2O2 · 2HCl). United Kingdom Original text. Later amendments are not shown. Division ← Division 4.9 Division 4.10 Division →