2016-1-9 · A few more esters. In each case, be sure that you can see how the names and formulae relate to each other. Notice that the acid is named by counting up the total number of carbon atoms in the chain - including the one in the -COOH group.So, for example, CH 3 CH 2 COOH is propanoic acid, and CH 3 CH 2 COO is the propanoate group.