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The correct IUPAC name of the following compound is:

1. 4-methyl-2-nitro-5-oxohept-3-enal
2. 4-methyl-5-oxo-2-nitrohept-3-enal
3. 4-methyl-6-nitro-3-oxohept-4-enal
4. 6-formyl-4-methyl-2-nitrohex-3-enal

Correct answer: 4-methyl-6-nitro-3-oxohept-4-enal

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