• British Pharmacopoeia Volume IV
  • Appendices
  • Appendix I A. General Reagents

l-Cysteine
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l -Cysteine C3H7NO2S  =  121.2 (52-90-4)

General reagent grade of commerce.

bp2010_v4_02_02_appendix_i_1a_a [alpha]_20_d.png, about +6.5 (10% w/v in 1m hydrochloric acid).