The arene and three carbonyl ligands are neutral, so chromium is in oxidation state zero, with a metal count. The eta-six arene contributes six electrons and each CO contributes two:
(1)
The methoxy group changes the electronic properties of the arene without changing this formal electron count. The complex is a piano-stool complex, with the coordinated arene as the seat and the three carbonyl ligands as the legs.

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