<page_title> Discovery and development of proton pump inhibitors </page_title> <section_title> Clinical pharmacology </section_title> <table> <cell> Rabeprazole <col_header> Compound </col_header> <col_header> X </col_header> </cell> <cell> 813, 892 and 321 <col_header> Cysteine binding </col_header> <col_header> year </col_header> </cell> </table>
Rabeprazole binds to cysteine 813, 892, and 321.