What are possible energy carriers besides ATP?

I'm thinking about designing an alien race. The race is carbon-based and evolved on a world with an average surface temperature between 40 and 60 degrees Celsius. Now, on Earth, almost all lifeforms use some form of nucleoside triphosphate, such as ATP or GTP, for energy exchange. What are possible alternative energy carriers besides nucleoside triphosphates? Bonus points if the energy carrier isn't phosphate-based, although that isn't a requirement.

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What are possible energy carriers besides ATP?

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