bspp (drug) bspp (drug) bspp is a compound used in scientific research which acts as a positive allosteric modulator at the gabab receptor. it has a synergistic effect with gabab agonists such as baclofen at gabab autoreceptors but not heteroreceptors, suggesting it may be useful for distinguishing between these gabab receptor subtypes. bsppclinical dataatc codenoneidentifiers iupac name 2,6-di-tert-butyl-4-phenol pubchem cid16079861chemspider17238838 ychemical and physical dataformulac21h34o2molar mass318.501 g·mol−13d model (jsmol)interactive image smiles c(c)(c)(c)c1=c(c(=cc(=c1)cc1(cccc1)co)c(c)(c)c)o inchi inchi=1s/c21h34o2/c1-19(2,3)16-11-15(12-17(18(16)23)20(4,5)6)13-21(14-22)9-7-8-10-21/h11-12,22-23h,7-10,13-14h2,1-6h3 ykey:ctfkomuxshqlll-uhfffaoysa-n y (verify)