[H] [C@@] 12 cc3 = C (C = C (CNCC (C) (C) C) C (O) = C3C (= O) C1 = C (O) [C@] 1 (O) C (= O) C (C O (N) =) = C (O) [C@@H] (N (C) C) [C@] 1 [H]) (C2) N (C) C

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