I could not find any USPTO filings using either agonist names along with 'Yuhan Corporation' in a quick look. Here you go: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=1&f=G&l=50&co1=AND&d=PG01&s1=yuhan.AS.&s2=fusion.AB.&OS=AN/yuhan+AND+ABST/fusion&RS=AN/yuhan+AND+ABST/fusion