Question: Explain why two different products are formed from disrotatory ring closure of (2E, 4Z, 6Z) octatriene, but only one product is formed from disrotatory ring

Explain why two different products are formed from disrotatory ring closure of (2E, 4Z, 6Z) octatriene, but only one product is formed from disrotatory ring closure of (2E, 4Z, 6E)-octatriene.

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