Arachidonic acid is the biosynthetic precursor to PGE2. The structures of PGE1 (see Figure 26.5) and PGE2 are identical except that PGE2 has one more double bond than PGE1. Suggest a reasonable structure for PGE2
FIGURE 26.5
Structures of two representative prosta-glandins. The numbering scheme is illustrated in the structure of PGE1.

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но COOH CH CH 19 13 HO но но Prostaglandin Et PGE1) но Prostaglandin Fia (PGFia)