The 1H-Indole-3-carboxaldehyde,4-hydroxy-, with the CAS registry number 81779-27-3, has the systematic name and IUPAC name of 4-hydroxy-1H-indole-3-carbaldehyde. And the molecular formula of the chemical is C₉H₇NO₂.

The characteristics of 1H-Indole-3-carboxaldehyde,4-hydroxy- are as followings: (1)ACD/LogP: 1.04; (2)# of Rule of 5 Violations: 0; (3)ACD/LogD (pH 5.5): 1; (4)ACD/LogD (pH 7.4): 1; (5)ACD/BCF (pH 5.5): 3; (6)ACD/BCF (pH 7.4): 3; (7)ACD/KOC (pH 5.5): 78; (8)ACD/KOC (pH 7.4): 77; (9)#H bond acceptors: 3; (10)#H bond donors: 2; (11)#Freely Rotating Bonds: 2; (12)Polar Surface Area: 53.09 Ų; (13)Index of Refraction: 1.784; (14)Molar Refractivity: 47.163 cm³; (15)Molar Volume: 111.967 cm³; (16)Polarizability: 18.697×10^-24cm³; (17)Surface Tension: 76.173 dyne/cm; (18)Density: 1.439 g/cm³; (19)Flash Point: 211.607 °C; (20)Enthalpy of Vaporization: 70.742 kJ/mol; (21)Boiling Point: 426.28 °C at 760 mmHg; (22)Vapour Pressure: 0 mmHg at 25°C.

Addtionally, the following datas could be converted into the molecular structure:
(1)SMILES: O=Cc2c1c(cccc1O)nc2
(2)InChI: InChI=1/C9H7NO2/c11-5-6-4-10-7-2-1-3-8(12)9(6)7/h1-5,10,12H
(3)InChIKey: QLBZIZLLMNWTHG-UHFFFAOYAG