N-Cyclopropyl-5-(thiophen-2-yl)isoxazole-3-carboxamide -d4 is labelled N-Cyclopropyl-5-(thiophen-2-yl)isoxazole-3-carboxamide (C988880) which was shown to exhibit regulatory effects towards the expression of pH sensing G protein-coupled receptor-68 and is now a new drug target for ischemic heart disease.