other process involving chemical transformation other than hydrolysis or electrolysis for preparation of the substance or mixture of substances in an active medicinal form3 A vitamin or provitamin, including salts and other compounds, of the following types:vitamin Avitamin B1vitamin B2vitamin B3vitamin B5vitamin B6vitamin B12vitamin Cvitamin Dvitamin Evitamin Kbiotincholinefolic acid4 A synthetic