[H] [C@@] (C) (CCC (O) = O) [C@@] 1 ([H]) CC [C@@] 2 [C@] ([H]) 3 ([H]) [C@] ([H]) (O) C (C@) 4 ([H]) C [C@] ([H]) (O) CC (C@) 4 (C) (C@@) 3 ([H]) C [C@] ([H]) (O) [C@] 12 C

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