IUPAC Name: [4-(4-Amino-6,7-dimethoxyquinazolin-2-yl)piperazin-1-yl]-(furan-2-yl)methanone
The MF of Prazosin (CAS NO.19216-56-9) is C₁₉H₂₁N₅O₄.

              
The MW of Prazosin (CAS NO.19216-56-9) is 383.4.
Synonyms of Prazosin (CAS NO.19216-56-9): [4-(4-amino-6,7-dimethoxyquinazolin-2-yl)piperazin-1-yl](furan-2-yl)methanone ; 1-(4-Amino-6, 7-dimethoxy-2-quinazolinyl)-4-(2-furoyl)piperazine monohydrochloride
Apperance: Crystallization
Index of Refraction: 1.651  
EINECS: 242-885-8
Density: 1.352 g/ml 
Flash Point: 339.9 °C
Boiling Point: 638.4 °C
Melting Point: 278-280 °C

  Prazosin (CAS NO.19216-56-9) is orally active and has a minimal effect on cardiac function due to its alpha-1 receptor selectivity.it is a second-line choice for the treatment of high blood pressure.Prazosin is also useful in treating urinary hesitancy associated with prostatic hyperplasia by blocking alpha-1 receptors, which control constriction of both the prostate and ureters.This medication has shown to be effective in treating severe nightmares in children, associated with PTSD symptoms.

 3,4-Dimethoxy--6-amino-benzonitrile generated 3,4-dimethoxy-6-Thiocyanate acyl benzonitrile in water and dichloromethane and sulfur anal phosgene (yield is 94% ).It would get thiourea derivative by reacted  with 1-(2-furan-carbonyl)-piperazine in ethyl acetate(yield is 90%). Then derived free S-methyl-isothiourea derivatives by methylated with methyl iodide to the reaction with the alkali treatment(yield is 95%). Finally,formamide prazosin was gotten by the reaction of S-methyl isothiourea biological, ammonia, ammonium chloride and urea.

Human systemic effects by ingestion of very small amounts: somnolence, hallucinations, distorted perceptions, changes in motor activity, decreased blood pressure, nausea or vomiting, and kidney effects. Experimental reproductive effects. When heated to decomposition it emits toxic fumes of NO_x.

 Prazosin is a sympatholytic drug used to treat high blood pressure (hypertension). It belongs to the class of alpha-adrenergic blockers, which lower blood pressure by relaxing blood vessels. Specifically, prazosin is selective for the alpha-1 receptors on vascular smooth muscle. These receptors are responsible for the vasoconstrictive action of norepinephrine, which would normally raise blood pressure. By blocking these receptors, prazosin reduces blood pressure.