Molecule structure of Resistab (CAS NO.63-56-9) :

IUPAC Name: N-[(4-methoxyphenyl)methyl]-N',N'-dimethyl-N-pyrimidin-2-ylethane-1,2-diamine hydrochloride 
Molecular Weight: 322.83302 g/mol
Molecular Formula: C₁₆H₂₃ClN₄O
Boiling Point: 440.6 °C at 760 mmHg 
Flash Point: 220.3 °C
Enthalpy of Vaporization: 69.78 kJ/mol
Vapour Pressure: 5.8E-08 mmHg at 25 °C
H-Bond Donor: 1
H-Bond Acceptor: 5
Rotatable Bond Count: 7
Exact Mass: 322.156039
MonoIsotopic Mass: 322.156039
Topological Polar Surface Area: 41.5
Heavy Atom Count: 22 
Complexity: 274
Canonical SMILES: CN(C)CCN(CC1=CC=C(C=C1)OC)C2=NC=CC=N2.Cl
InChI: InChI=1S/C16H22N4O.ClH/c1-19(2)11-12-20(16-17-9-4-10-18-16)13-14-5-7-15(21-3)8-6-14;/h4-10H,11-13H2,1-3H3;1H
InChIKey: HRYJPHOTGFERGT-UHFFFAOYSA-N
EINECS: 200-561-3

Poison by ingestion, intravenous, and intraperitoneal routes. Used as an antihistamine. When heated to decomposition it emits very toxic fumes of HCl and NO_x.

 Resistab (CAS NO.63-56-9) is also called 2-((2-(Dimethylamino)ethyl)(p-methoxy-benzyl)amino)-pyrimidine hydrochloride ; 2-((2-(Dimethylamino)ethyl)(p-methoxybenzyl)amino)pyrimidine hydrochloride ; 2-{(2-(Dimethylamino)ethyl)(p-methoxybenzyl)amino}pyrimidine hydrochloride ; Anahist ; CCRIS 6277 ; N,N-Dimethyl-N'-(4-methoxybenzyl)-N'-(2-
pyrimidyl)ethylenediamine hydrochloride ; N-p-Methoxybenzyl-N',N'-dimethyl-N-2-pyrimidinylethylene diamine hydrochloride ; Neohetramine hydrochloride ; Novohetramin ; Super Anahist ; Thonzylamine HCl ; Thonzylamine hydrochloride ; Thonzylaminium chloride ; UNII-6K9YKD48Y4 . Resistab (CAS NO.63-56-9) is white crystalline powder with a faint odor. Resistab is water soluble. It behaves as a weak organic acid. The resulting solutions contain moderate concentrations of hydrogen ions and have pH's of less than 7.0. They react as acids to neutralize bases. These neutralizations generate heat, but less or far less than is generated by neutralization of inorganic acids, inorganic oxoacids, and carboxylic acid. They usually do not react as either oxidizing agents or reducing agents but such behavior is not impossible. Symptoms of exposure to Resistab may include drowsiness, lethargy, fatigue, hypnosis, coma, vertigo, ataxia, tinnitus, blurred vision, tremors, anxiety, insomnia, excitement, hallucinations, delirium, convulsions, dry mouth, anorexia, nausea, vomiting, abdominal distress, constipation, diarrhea, central nervous system depression, gastrointestinal reactions, respiratory arrest and circulatory collapse. Flash point data for Resistab are not available. It is probably combustible.