This is very brittle: it works really well on the pre-canned examples but the vocabulary seems very tightly linked. It doesn't handle something as simple as:

'the patient had no pain but did have nausea'

Doesn't yield any helpful on semantic role labeling and didn't even parse on machine comprehension. If I vary it to say ask 'did the patient have pain?' the answer is 'nausea'.

CoreNLP provides much more useful analysis of the phrase structure and dependencies.