5-mbpb 5-mbpb 5-mbpb (also known as 5-mpbp and 5-mabb) is an amphetamine derivative which is structurally related to mdma and has been sold as a designer drug. it can be described as the benzofuran-5-yl analogue of mbdb or the butanamine homologue of 5-mapb, and is also a structural isomer of 5-eapb and 6-eapb. anecdotal reports suggest this compound has been sold as a designer drug in various european countries since early 2015, but the first definitive identification was made in december 2015 by a forensic laboratory in slovenia. 5-mbpbclinical dataatc codenonelegal statuslegal status ca: schedule i de: npsg (industrial and scientific use only) uk: class b identifiers iupac name 1-(1-benzofuran-5-yl)-n-methylbutan-2-amine pubchem cid139033209chemspider52085237uniiyhb7yws4wjchemical and physical dataformulac13h17nomolar mass203.28 g/mol (freebase) 239.78 g/mol (hydrochloride) g·mol−13d model (jsmol)interactive image smiles ccc(cc1=cc2=c(oc=c2)c=c1)nc inchi inchi=1s/c13h17no/c1-3-12(14-2)9-10-4-5-13-11(8-10)6-7-15-13/h4-8,12,14h,3,9h2,1-2h3key:ctezpbclikeasw-uhfffaoysa-n 5-mbpb is similar in structure to compounds such as 5-apb which are claimed to be agonists of the 5-ht2c receptor.