[H] N (C1 = C ([H]) ([H]) = C (\ C ([H]) = C (/ [H]) C2 = C ([H]) N = C (OC ([H]) ([H]) C ([H]) ([H]) OC ([H]) ([H]) C ([H]) ([H]) OC ([H]) ([H]) C ([H]) ([H]) [18 f]) C ([H]) = C2 [H]) C ([H]) = C1 [H]) C ([H]) ([H]) [H]

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