What compound is this?
Carbohydrates
Lipids
Nucleic acids
Proteins

Proteins.

Explanation:

Use these mnemonics:

Carbohydrates & Lipids - CHO

Proteins - CHON

Nucleic acids - CHONP

We can immediately eliminate carbohydrates and lipids, as we can see an "N". There is not a "P" visible either, meaning we can rule out nucleic acids. We are left with proteins.

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