chloroethylnorapomorphine chloroethylnorapomorphine chloroethylnorapomorphine is a chemical once thought to be an irreversible dopamine d2 receptor antagonist; however, it was later proved to be reversible. chloroethylnorapomorphine names iupac name 12a-chloro-12a-homo-6aβ-aporphine-10,11-diol systematic iupac name (6ar)-6-(2-chloroethyl)-5,6,6a,7-tetrahydro-4h-dibenzoquinoline-10,11-diol other names (−)-n-(2-chloroethyl)-norapomorphine identifiers cas number 75946-94-0 n 3d model (jsmol) interactive image chembl chembl283871 y chemspider 137707 y pubchem cid 156376 unii vd4272r3ub y comptox dashboard (epa) dtxsid90226853 inchi inchi=1s/c18h18clno2/c19-7-9-20-8-6-11-2-1-3-13-16(11)14(20)10-12-4-5-15(21)18(22)17(12)13/h1-5,14,21-22h,6-10h2/t14-/m1/s1 ykey: rmkwdbuexhjprz-cqszacivsa-n y smiles c1cn(2cc3=c(c4=c2c1=cc=c4)c(=c(c=c3)o)o)cccl properties chemical formula c18h18clno2 molar mass 315.80 g·mol−1 except where otherwise noted, data are given for materials in their standard state (at 25 °c , 100 kpa). n verify (what is yn ?) infobox references