IUPAC Name: 2-Mino-9-[(2R,3R,4R,5R)-4-Hydroxy-5-(Hydroxymethyl)-3-Methoxyoxolan-2-yl]-3H-Purin-6-One
CAS: 2140-71-8
Following is the Molecular Structure of 2'-O-Methylguanosine (2140-71-8):

SMILES: O=C3/N=C(/N)Nc1c3ncn1[C@@H]2O[C@@H]([C@@H](O)[C@H]2OC)CO
InChI: InChI=1/C11H15N5O5/c1-20-7-6(18)4(2-17)21-10(7)16-3-13-5-8(16)14-11(12)15-9(5)19/h3-4,6-7,10,17-18H,2H2,1H3,(H3,12,14,15,19)/t4-,6-,7-,10-/m1/s1
InChIKey: OVYNGSFVYRPRCG-KQYNXXCUBK
Std. InChI: InChI=1S/C11H15N5O5/c1-20-7-6(18)4(2-17)21-10(7)16-3-13-5-8(16)14-11(12)15-9(5)19/h3-4,6-7,10,17-18H,2H2,1H3,(H3,12,14,15,19)/t4-,6-,7-,10-/m1/s1
Std. InChIKey: OVYNGSFVYRPRCG-KQYNXXCUSA-N
Molecular Formula: C₁₁H₁₅N₅O₅
Molar Volume: 149.8cm³
Boiling Point: 711.7℃ at 760mmHg
Flash Point: 384.2℃
Density: 1.98g/cm³
Molar Refractivity: 65.77cm³
Polarizability: 26.07 10^-24cm³
Enthalpy of Vaporization: 109.26kJ/mol
Vapour Pressure: 2.93E-21mmHg at 25℃ 

Hazard Codes: Xi Irritant.
Risk Statements: 36/37/38.
R36 Irritating to eyes.
R37 Irritating to respiratory system.
R38 Irritating to skin.
Safety Statements: 26-36.
S26 In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.
S27 Take off immediately all contaminated clothing.
S28 After contact with skin, wash immediately with plenty of soap-suds.
S29 Do not empty into drains.
S30 Never add water to this product.
S33 Take precautionary measures against static discharges.
S35 This material and its container must be disposed of in a safe way.
S36 Wear suitable protective clothing.

 2'-O-Methylguanosine (2140-71-8), which also can be called for 2'-O-Methyl Guanosine ; 2'-O-Methyl-D-Guanosine . 2'-O-Methylguanosine (2140-71-8) is a kind of crystalline powder.