INTERNATIONAL COUNCIL FOR HARMONISATION OF TECHNICAL REQUIREMENTS FOR PHARMACEUTICALS FOR HUMAN USE ICH HARMONISED GUIDELINE IMPURITIES : G UIDELINE FOR R ESIDUAL SOLVENTS Q3C (R 9) Current Step 4 version dated 22 April 2021 This Gui deline has been developed by the appropriate ICH Expert Working Group and has been subject to consultation by the regulatory parties, in accordance with the ICH Process. At Step 4 of the Process the final draft is recommended for adoption to the regulator y bodies of ICH regions.