The Distearyl thiodipropionate, with the CAS registry number 693-36-7 and EINECS registry number 211-750-5, has the IUPAC name of octadecyl 3-(3-octadecoxy-3-oxopropyl)sulfanylpropanoate. It is also known as DSTP. And the molecular formula of the chemical is C₄₂H₈₂O₄S. Wha's more, it is always used as auxiliary antioxidizer of polypropylene, polyethylene, synthetic rubber, etc.

The physical properties of Distearyl thiodipropionate are as followings: (1)ACD/LogP: 19.26; (2)# of Rule of 5 Violations: 2; (3)ACD/LogD (pH 5.5): 19.26; (4)ACD/LogD (pH 7.4): 19.26; (5)ACD/BCF (pH 5.5): 1000000; (6)ACD/BCF (pH 7.4): 1000000; (7)ACD/KOC (pH 5.5): 10000000; (8)ACD/KOC (pH 7.4): 10000000; (9)#H bond acceptors: 4; (10)#H bond donors: 0; (11)#Freely Rotating Bonds: 42; (12)Polar Surface Area: 77.9 Å²; (13)Index of Refraction: 1.472; (14)Molar Refractivity: 208.17 cm³; (15)Molar Volume: 742.7 cm³; (16)Polarizability: 82.52×10^-24cm³; (17)Surface Tension: 34.7 dyne/cm; (18)Density: 0.919 g/cm³; (19)Flash Point: 323.7 °C; (20)Enthalpy of Vaporization: 103.13 kJ/mol; (21)Boiling Point: 704.8 °C at 760 mmHg; (22)Vapour Pressure: 1.03E-19 mmHg at 25°C.

Preparation: This chemical can be prepared by 3,3'-sulfanediyl-bis-propionic acid and octadecan-1-ol. The reaction will need reagent conc. sulphuric acid.  

You should be cautious while dealing with this chemical. It irritates to eyes, respiratory system and skin. Therefore, you had better take the following instructions: Wear suitable protective clothing, gloves and eye/face protection, and if in case of contacting with eyes, rinse immediately with plenty of water and seek medical advice. 

You can still convert the following datas into molecular structure:
(1)SMILES: O=C(OCCCCCCCCCCCCCCCCCC)CCSCCC(=O)OCCCCCCCCCCCCCCCCCC
(2)InChI: InChI=1/C42H82O4S/c1-3-5-7-9-11-13-15-17-19-21-23-25-27-29-31-33-37-45-41(43)35-39-47-40-36-42(44)46-38-34-32-30-28-26-24-22-20-18-16-14-12-10-8-6-4-2/h3-40H2,1-2H3
(3)InChIKey: PWWSSIYVTQUJQQ-UHFFFAOYAP

The toxicity data is as follows: