I have searched in ExPASy about the sequence of Minnelide or Triptolide. Can any one suggest where I can find the protein sequence of those two. And please let me know, if genome sequence of Tripterygium wilfordii is available.
It can't be specified much further. They are simply small-molecule compounds i.e. like aspirin, sunitinib, staurosporine, and most other drugs that you are aware of. They are not made up of a chain of amino acids so they are not proteins and you will not be able to find them in any protein database. You likely will find them on pubchem.