Unfortunately, The Supreme Court expressly declined to decide whether the exemption is available for use of patented research tools so this is yet to be dealt with in future cases. Enjoyed addressing the issue with you guys from the legal department :-)
If you read the link I posted earlier, you will see that this has even been extended to medical devices - a long way from compounds:
My overall point here is that a MNTA patent suit against Teva is by no means a sure winner. At the end of the day I doubt if the suit is something most investors will place much value in, although clearly it has the potential for a huge (perhaps billion dollar) payout.