The Gon-4-ene-3,17-dione,13-ethyl-, with the CAS registry number 21800-83-9, has the systematic name of (8R,9S,10R,13S,14S)-13-ethyl-7,8,9,10,11,12,13,14,15,16-decahydro-1H-cyclopenta[a]phenanthrene-3,17(2H,6H)-dione (non-preferred name). It is a kind of light yellow crystalline solid, and belongs to the following product categories: Pharmaceutical Intermediates; Intermediates & Fine Chemicals; Pharmaceuticals; Steroids. And the molecular formula of the chemical is C₁₉H₂₆O₂.

The characteristics of Gon-4-ene-3,17-dione,13-ethyl- are as followings: (1)ACD/LogP: 2.95; (2)# of Rule of 5 Violations: 0; (3)ACD/LogD (pH 5.5): 2.95; (4)ACD/LogD (pH 7.4): 2.95; (5)ACD/BCF (pH 5.5): 102.61; (6)ACD/BCF (pH 7.4): 102.61; (7)ACD/KOC (pH 5.5): 957.7; (8)ACD/KOC (pH 7.4): 957.7; (9)#H bond acceptors: 2; (10)#H bond donors: 0; (11)#Freely Rotating Bonds: 1; (12)Polar Surface Area: 34.14 Å²; (13)Index of Refraction: 1.55; (14)Molar Refractivity: 81.68 cm³; (15)Molar Volume: 256 cm³; (16)Polarizability: 32.38×10^-24cm³; (17)Surface Tension: 42.9 dyne/cm; (18)Density: 1.11 g/cm³; (19)Flash Point: 166 °C; (20)Enthalpy of Vaporization: 70.32 kJ/mol; (21)Boiling Point: 445.2 °C at 760 mmHg; (22)Vapour Pressure: 4.01E-08 mmHg at 25°C. 

Addtionally, the following datas could be converted into the molecular structure:
(1)SMILES: O=C4/C=C3/CC[C@@H]2[C@H](CC[C@@]1(C(=O)CC[C@H]12)CC)[C@H]3CC4
(2)InChI: InChI=1/C19H26O2/c1-2-19-10-9-15-14-6-4-13(20)11-12(14)3-5-16(15)17(19)7-8-18(19)21/h11,14-17H,2-10H2,1H3/t14-,15+,16+,17-,19-/m0/s1
(3)InChIKey: SBLHOJQRZNGHLQ-ATIFRJIPBY