5-Aminosalicylic Acid Derivatives 5-Alpha-Reductase Inhibitors aminosalicylic acid Apriso Asacol HD Azulfidine Azulfidine EN balsalazide Canasa Colazal Delzicol Dipentum Giazo Lialda mesalamine mesalamine rectal olsalazine Paser Pentasa Rowasa sulfasalazine