Alternative biological oxidizer

A concept I've encountered a few times is aliens with "vastly" different biology than terrestrial creatures. In this case, I'm interested in replacing the parts that use oxygen with something a bit milder (a worse oxidizer).

I'm looking for something that would, biologically, serve the same function as oxygen in a human. It should be a gas in a reasonable temperature range around liquid water, and it should be reasonably produced in sufficient quantity by natural processes although I'm not concerned with the actual manner in how it is produced.

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Alternative biological oxidizer

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