The roadmap that MAPS has produced for getting FDA approval for MDMA shows that it will cost about 20M in total. I think the salary they're paying their own staff is probably unrealistically low for a for-profit, and they also had some of the pre-clinical work done for them. But at the same time they've incurred enormous costs due to the fact that MDMA is schedule I, so all in all this probably isn't a bad estimate for the actual cost of getting a new drug approved.