{HEAD ~ This invention} relates to {TAIL ~ inhibitors} of cysteine proteases, especially those of the papain superfamily 
relates to
{ HEAD ~ This invention } relates to { TAIL ~ inhibitors } of cysteine proteases , especially those of the papain superfamily
HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH