This chemical is called Purpurin 18, and it can also be named as Purpurin a. With the CAS number of 25465-77-4, its systematic name is 21H,23H-Porphine-2,20-dicarboxylic acid, 18-(2-carboxyethyl)-12-ethenyl-7-ethyl-17,18-dihydro-3,8,13,17-tetramethyl-, cyclic 2,20-anhydride, (17S-trans)-. In addition, the molecular formula of the Purpurin 18 is C₃₃H₃₂N₄O₅, and its molecular weight is 564.63. However, this chemical is green-brown solid, and it is isolated from chlorophyll.

Other characteristics of the Purpurin 18 can be summarised as followings: (1)ACD/LogP: 5.93; (2)# of Rule of 5 Violations: 2; (3)#H bond acceptors: 9; (4)#H bond donors: 3; (5)#Freely Rotating Bonds: 5; (6)Polar Surface Area: 138.03 Å²; (7)Index of Refraction: 1.641; (8)Molar Refractivity: 155.24 cm³; (9)Molar Volume: 429.8 cm³; (10)Polarizability: 61.54×10^-24cm³; (11)Surface Tension: 60.1 dyne/cm; (12)Density: 1.313 g/cm³; (13)Flash Point: 586.5 °C; (14)Enthalpy of Vaporization: 160.33 kJ/mol; (15)Boiling Point: 1046.1 °C at 760 mmHg; (16)Vapour Pressure: 0 mmHg at 25°C.

You can still convert the following datas into molecular structure: 
(1)SMILES: OC(=O)CC[C@@H]6c1nc(cc5nc(cc4nc(cc2nc3c1C(=O)OC(=O)c3c2C)C(\CC)=C4\C)c(C=C)c5C)[C@H]6C
(2)InChI: InChI=1/C33H32N4O5/c1-7-18-14(3)21-11-23-16(5)20(9-10-27(38)39)30(36-23)29-31-28(32(40)42-33(29)41)17(6)24(37-31)13-26-19(8-2)15(4)22(35-26)12-25(18)34-21/h7,11-13,16,20,34,37H,1,8-10H2,2-6H3,(H,38,39)/b21-11-,22-12-,23-11-,24-13-,25-12-,26-13-,30-29+/t16-,20-/m0/s1
(3)InChIKey: BJKHCHNVSUFKBF-HUNLNFSZBD