Amidohydrolase that hydrolyzes specifically one of the carboamide linkages in D-pantetheine thus recycling pantothenic acid (vitamin B5) and releasing cysteamine. {ECO:0000269|PubMed:10567687, ECO:0000269|PubMed:11491533, ECO:0000269|PubMed:25478849}. This is the function of Ensembl gene identifier ENSG00000112299 (VNN1, vanin 1).