4c-b 4c-b 4c-b (also known as 4c-dob or dob-b) is a lesser-known psychedelic drug which is related to 2c-b and dob. it is a reasonably potent 5-ht2a receptor partial agonist with a ki of 7.6nm, but has relatively low efficacy (15% relative to 5-ht). it is briefly mentioned in alexander shulgin's book pihkal (phenethylamines i have known and loved) but was never tested by him, however it has subsequently been tested by other researchers and was found to be active in a dose range of 50-80mg with a duration of around 8 hours, though with generally milder effects than 2c-b or dob. 4c-b names preferred iupac name 1-(4-bromo-3,5-dimethoxyphenyl)butan-2-amine other names 4c-dob, dob-b identifiers cas number 69294-23-1 3d model (jsmol) interactive image chembl chembl365711 chemspider 23256805 pubchem cid 12140147 inchi inchi=1s/c12h18brno2/c1-4-9(14)5-8-6-12(16-3)10(13)7-11(8)15-2/h6-7,9h,4-5,14h2,1-3h3key: qqprorazqwlmtq-uhfffaoysa-n smiles ccc(cc1=cc(=c(c=c1oc)br)oc)n properties chemical formula c12h18brno2 molar mass 288.185 g·mol−1 melting point 204-206 °c except where otherwise noted, data are given for materials in their standard state (at 25 °c , 100 kpa). infobox references