Why following compound is anti-aromatic?

Question

This compound is not even have complete conjugation. Yeah, even though it follows (4n)π electrons rule.

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Answer 1 · 2018-07-25T06:56:53

Well, how many #pi-"electrons"# you got?

I count FOUR....and these are delocalized around a six-membered ring. Given this, it is an analogue of cyclobutadiene, and therefore ANTIAROMATIC.

Of course, this would be an high energy species, that I doubt has been isolated....