The CAS register number of Demethoxycurcumin is 24939-17-1. It also can be called as 4-Hydroxycinnamoyl(feroyl)methane and the IUPAC name about this chemical is (1E,6E)-1-(4-hydroxy-3-methoxyphenyl)-7-(4-hydroxyphenyl)hepta-1,6-diene-3,5-dione. The molecular formula about this chemical is C₂₀H₁₈O₅ and molecular weight is 338.35. This chemical can be isolated from rhizomes of Curcuma longa.

Physical properties about Demethoxycurcumin are: (1)ACD/LogP: 3.15; (2)#H bond acceptors: 5; (3)#H bond donors: 2; (4)#Freely Rotating Bonds: 9; (5)Polar Surface Area: 61.83Ų; (6)Index of Refraction: 1.659; (7)Molar Refractivity: 97.36 cm³; (8)Molar Volume: 263.8 cm³; (9)Polarizability: 38.6x10^-24cm³; (10)Surface Tension: 56.9 dyne/cm; (11)Enthalpy of Vaporization: 88.86 kJ/mol; (12)Boiling Point: 571.4 °C at 760 mmHg; (13)Vapour Pressure: 1.17E-13 mmHg at 25°C.

You can still convert the following datas into molecular structure:
(1)SMILES: O=C(\C=C\c1ccc(O)cc1)CC(=O)\C=C\c2cc(OC)c(O)cc2
(2)InChI: InChI=1/C20H18O5/c1-25-20-12-15(6-11-19(20)24)5-10-18(23)13-17(22)9-4-14-2-7-16(21)8-3-14/h2-12,21,24H,13H2,1H3/b9-4+,10-5+
(3)InChIKey: HJTVQHVGMGKONQ-LUZURFALBK
(4)Std. InChI: InChI=1S/C20H18O5/c1-25-20-12-15(6-11-19(20)24)5-10-18(23)13-17(22)9-4-14-2-7-16(21)8-3-14/h2-12,21,24H,13H2,1H3/b9-4+,10-5+
(5)Std. InChIKey: HJTVQHVGMGKONQ-LUZURFALSA-N