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#1263 Up↑ /53 Down↓ [Report] 2010-05-12 21:37 EDT
// Organic chemistry
Dr. Li: There are lotsa groups that are same in a structural formula. Like there are students with same name.
Dr. Li: If I had 2 David Lees, 1 would be called David Lee-1 and David Lee-2.
Dr. Li: That is why you name groups Ethyl-1 and Ethyl-2.