Yeah. It exists. If I only knew where. There is a probability matrix for each condition and each drug, based on the true relationships found in the data. I can ask around, Which OSIM file are you using?
But if you really want to go that deep into this it may be better if you build one from scratch, the code is available. As explained in this Forum debate, nobody is really working on OSIM2 anymore, but there are other initiatives.