Brief Article
Copyright ©2013 Baishideng Publishing Group Co.
World J Gastroenterol. Mar 7, 2013; 19(9): 1444-1450
Published online Mar 7, 2013. doi: 10.3748/wjg.v19.i9.1444
Figure 1
Figure 1 Chemical structure of thienorphine and buprenorphine.