sch-23390 sch-23390 sch-23390 also known as halobenzazepine, is a synthetic compound that acts as a d1 receptor antagonist and has either minimal or negligible effects on the d2 receptor. sch-23390 names iupac name 7-chloro-3-methyl-1-phenyl-1,2,4,5-tetrahydro-3-benzazepin-8-ol identifiers cas number 87075-17-0 y 3d model (jsmol) interactive image chebi chebi:73297 n chembl chembl62 n iuphar/bps 943 pubchem cid 5018 unii ugt5535req y comptox dashboard (epa) dtxsid60873373 dtxsid40873376, dtxsid60873373 smiles cn1ccc2=cc(=c(c=c2c(c1)c3=cc=cc=c3)o)cl properties chemical formula c17h18clno molar mass 287.78 g/mol 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 in a 1990 study in rats sch-23390 offered significant protection from death in dextroamphetamine overdosage, without providing protection from death by methamphetamine overdose. the compound provided significant protection from cocaine overdose in rats only at the lowest dose tested in the measurement series. this suggested that d-amphetamine and methamphetamine at high (lethal) doses have different mechanisms of toxicity in rats.