C6 NBD glucosylceramide (d18:1/6:0) is a biologically active derivative of glucosylceramide that is tagged with a fluorescent C-6 nitrobenzoxadiazole (C-6 NBD; ) group. C6 NBD glucosylceramide (d18:1/6:0) has been used to study the metabolism and internalization of glucosylceramide. [Matreya, LLC. Catalog No. 1622]