How to find out the energy gained from hydrolysis of Dimethylsulfoniopropionate? I am trying to find out what the energy gain from hydrolysis of DMSP (Dimethylsulfoniopropionate) is, versus the energy gain from oxidation of a sugar or carb (e.g. glucose) in a terrestrial atmosphere.

To be clear, I am talking about the 'cleavage of chemical bonds by the addition of water' to DMSP. 

This question is motivated by the issue of whether heterotrophic animals living in a reducing atmosphere of an exoplanet which has no free atmospheric oxygen might use DMSP or some similar compound for energy storage in preference to carbohydrates.

DMSP was mentioned by the paper linked below, which suggests that ocean algae get energy from this process and so could alien metabolisms which don't have access to O2. The author states that the energy available from hydrolysis of DMSP is the same in a reducing or oxidising atmosphere but doesn't state what that energy gain actually is in j/mol. 

I realise the actual energy storage molecular species used by an actual organism on such a planet is probably going to be something else, but this seems like a good proxy.

"Photosynthesis in Hydrogen-Dominated Atmospheres", William Bains, Sara Seager and Andras Zsom
When the literature refers to "hydrolysis" of DMSP, it is referring to the following cleavage reaction, even though no water is involved in the overall reaction:

DMSP --> DMS + acrylate + H+

See for example at page 156 of Biological and Environmental Chemistry of DMSP and Related Sulfonium Compounds: "hydrolysis of DMSP to DMS and acrylic acid".

For the above reaction:

$\Delta G = -11.8$ kcal/mol 

Source: MetaCyc Reaction: 4.4.1.3

This means 11.8 kilocalories (49.4 kilojoules) of energy are released for each mole of DMSP that reacts.