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5-Dehydro-m-xylylene
5-dehydro-m-xylylene, alternatively known as 5-dehydro-1,3-quinodimethane or DMX, is an aromatic organic triradical and the first known organic molecule to violate Hund's Rule. Its electronic ground state is an "open-shell doublet" rather than a quartet; that is, it contains three low-spin coupled unpaired electrons in three singly occupied molecular orbitals.
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