firstly its depend on type of ex-plant.Ms medium gave better response as compared to B 5,WPM medium so i suggest you to use MS medium with different hormones alone and in combination for the micro propagation of Pterocarpus santalinus.
This is a paper (see attachment) about the micropropagation of Pterocarpus santalinus L. It mentions media and some components in the paper. I think that you can use their protocol as a start, then depending on your genotype/variety, you might need to modify a little later.
I agree with Mr, Bhushan that its depend on the type of ex-plant that you have chosen. Usually Ms medium will give response as compared to B 5,WPM medium. In case if you have already tried many times with MS medium with different combination then you try with B5 and WPM media with different hormones for the micro propagation of Pterocarpus