Humans lack an enzyme that oxidizes an L-configured example of this moiety, which then spontaneously converts into an enediol (“een-diol”) form. One of these moieties is bound to cyclopentane in a compound secreted by Nepeta plants that leads to the attractive qualities (15[1])of catnip. Most aldosterone antagonists are in a class of steroids named for this moiety, which is found at the 17-alpha carbon (-5[1])in a spiro position. (15[2]-5[1])Vibrio fischeri uses N-acyl (15[1])(*) homoserine (10[1])examples (10[2])of these (10[1])compounds as autoinducers in quorum sensing. Large examples of this functional group are found in a class of antibiotics that bind to the 50S subunit of the bacterial ribosome, (-5[1])such as (-5[1])erythromycin. Vitamin C contains a 5-membered example of this functional (-5[1])group similar to furan. These (-5[1])single-ring compounds are formed in intermolecular Fischer reactions. For 10 points, name these cyclic esters. ■END■ (10[3]0[4])