sib-1553a sib-1553a sib-1553a is a nicotinic acetylcholine receptor agonist that is selective for receptors with a β4 subunit. administration of sib-1553a improved memory and attention in a parkinson's disease model. sib-1553a names preferred iupac name 4-phenol identifiers cas number 191611-76-4 y 3d model (jsmol) interactive image chembl chembl47850 chemspider 4470512 pubchem cid 5310968 unii tf4a9p6t8r y comptox dashboard (epa) dtxsid70940803 inchi inchi=1s/c13h19nos/c1-14-9-2-3-11(14)8-10-16-13-6-4-12(15)5-7-13/h4-7,11,15h,2-3,8-10h2,1h3key: nvzgjsvpooildi-uhfffaoysa-ninchi=1/c13h19nos/c1-14-9-2-3-11(14)8-10-16-13-6-4-12(15)5-7-13/h4-7,11,15h,2-3,8-10h2,1h3key: nvzgjsvpooildi-uhfffaoyav smiles oc1=cc=c(sccc2cccn2c)c=c1 properties chemical formula c13h19nos molar mass 237.36 g·mol−1 except where otherwise noted, data are given for materials in their standard state (at 25 °c , 100 kpa). infobox references