The Giemsa's stain, with CAS registry number 51811-82-6, belongs to the following product category: UVCBs-organic. It has the systematic name of N-(7-amino-3H-phenothiazin-3-ylidene)-N-methylmethanaminium chloride. This chemical is a kind of dark green to greenish-black fine cryst. powder. And it should be stored at room temperature. What's more, its EINECS is 257-438-2.

Physical properties of Giemsa's stain: (1)ACD/LogP: 0.42; (2)# of Rule of 5 Violations: 0; (3)ACD/LogD (pH 5.5): 0.34; (4)ACD/LogD (pH 7.4): 0.42; (5)ACD/BCF (pH 5.5): 1.03; (6)ACD/BCF (pH 7.4): 1.23; (7)ACD/KOC (pH 5.5): 33.77; (8)ACD/KOC (pH 7.4): 40.28; (9)#H bond acceptors: 3; (10)#H bond donors: 2; (11)#Freely Rotating Bonds: 1; (12)Polar Surface Area: 43.91 Å²; (13)Flash Point: 221.6 °C; (14)Enthalpy of Vaporization: 71.38 kJ/mol; (15)Boiling Point: 442.8 °C at 760 mmHg; (16)Vapour Pressure: 3.03E-08 mmHg at 25°C.

When you are using this chemical, please be cautious about it as the following:
The Giemsa's stain is highly flammable, so keep it away from sources of ignition. This chemical is toxic by inhalation, in contact with skin and if swallowed. And it is harmful in contact with skin. It irritates to eyes and skin and has risk of serious damage to the eyes. It may cause heritable genetic damage. What's more, it also has risk of impaired fertility and has possible risk of harm to the unborn child. You should keep its container tightly closed, so avoid exposure - obtain special instructions before use. When use it, wear suitable protective clothing, gloves and eye/face protection. If contact with eyes, rinse immediately with plenty of water and seek medical advice. In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) 

You can still convert the following datas into molecular structure:
(1)SMILES: [Cl-].N=1c3c(SC=2C=1\C=C/C(=[N+](/C)C)/C=2)cc(cc3)N
(2)InChI: InChI=1/C14H13N3S.ClH/c1-17(2)10-4-6-12-14(8-10)18-13-7-9(15)3-5-11(13)16-12;/h3-8,15H,1-2H3;1H
(3)InChIKey: NALREUIWICQLPS-UHFFFAOYAM
(4)Std. InChI: InChI=1S/C14H13N3S.ClH/c1-17(2)10-4-6-12-14(8-10)18-13-7-9(15)3-5-11(13)16-12;/h3-8,15H,1-2H3;1H
(5)Std. InChIKey: NALREUIWICQLPS-UHFFFAOYSA-N