- Peristomal allergic contact dermatitis to stoma-adhesive paste containing monobutyl ester/maleic acid of polymethylvinylether (Gantrez 425) but not to Isopropyl ester/maleic anhydride of polymethylvinylether (Gantrez 335). Field, S., O'Sullivan, C., Murphy, M., Bourke, J.F. Contact Derm. (2010)