D-NMAPPD is an Acid Ceramidase (ceramidase) inhibitor, which acts to keep ceramide concentrations low and maintain cell viability in normal cells. The inhibition of Acid Ceramidase (ceramidase) in both non-cancerous and malignant cells leads to apoptosis. D-NMAPPD is a potent Acid Ceramidase (ceramidase) inhibitor that induces apoptosis.