The function of Dopamine (CAS NO.51-61-6) as a neurotransmitter was discovered in 1958 by Arvid Carlsson and Nils-?ke Hillarp at the Laboratory for Chemical Pharmacology of the National Heart Institute of Sweden. It was named dopamine(51-61-6) because it was a monoamine, and its synthetic precursor was 3,4-dihydroxyphenylalanine (L-DOPA). Arvid Carlsson was awarded the 2000 Nobel Prize in Physiology or Medicine for showing that dopamine(51-61-6) is not just a precursor of norepinephrine (noradrenaline) and epinephrine (adrenaline) but a neurotransmitter, as well.
Dopamine(51-61-6) was first synthesized in 1910 by George Barger and James Ewens at Wellcome Laboratories in London, England.

The CAS registry number of Dopamine is 51-61-6. In addition, the molecular formula is C₈H₁₁NO₂. It is a catecholamine neurotransmitter which present in a wide variety of animals, including both vertebrates and invertebrates. And it is produced in several areas of the brain, including the substantia nigra and the ventral tegmental area. Moreover, its main function as a hormone is to inhibit the release of prolactin from the anterior lobe of the pituitary.

Physical properties about this chemical are: (1)ACD/LogP: 0.05; (2)ACD/BCF (pH 5.5): 1; (3)ACD/BCF (pH 7.4): 1; (4)ACD/KOC (pH 5.5): 1; (5)ACD/KOC (pH 7.4): 1; (6)#H bond acceptors: 3; (7)#H bond donors: 4; (8)#Freely Rotating Bonds: 5; (9)Polar Surface Area: 66.48 Å²; (10)Index of Refraction: 1.619; (11)Molar Refractivity: 43.101 cm³; (12)Molar Volume: 122.788 cm³; (13)Polarizability: 17.086 ×10^-24cm³; (14)Surface Tension: 60.841 dyne/cm; (15)Density: 1.248 g/cm³; (16)Flash Point: 158.03 °C; (17)Enthalpy of Vaporization: 60.399 kJ/mol; (18)Boiling Point: 337.69 °C at 760 mmHg.

Preparation of Dopamine: it is synthesized by demethylation of 2-(3,4-dimethoxyphenyl)ethylamine through using hydrogen bromide.

Uses of Dopamine: it can be used as a medicinal agent. And it is available as an intravenous medication acting on the sympathetic nervous system, and can increase heart rate and blood pressure. In addition, it can react with N-Methoxydiacetamide to get N-(3,4-dihydroxy-phenethyl)-acetamide. This reaction will need reagent sodium acetate and solvent dimethylformamide. The reaction time is 4.5 hours with ambient temperature. The yield is about 31%.

You can still convert the following datas into molecular structure:
(1)SMILES: c1cc(c(cc1CCN)O)O
(2)InChI: InChI=1/C8H11NO2/c9-4-3-6-1-2-7(10)8(11)5-6/h1-2,5,10-11H,3-4,9H2
(3)InChIKey: VYFYYTLLBUKUHU-UHFFFAOYAA

The toxicity data is as follows: