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The circulatory surface provides the interface between the body and the respiratory medium.
Antiaromatic
A compound that is cyclic, conjugated, but does not follow Huckel's rule, often being less stable due to its electron configuration.
Nonaromatic
Organic compounds that do not fulfill the criteria for aromaticity, lacking the special stability observed in aromatic systems.
Fused-ring Heterocycle
A cyclic compound where two or more rings share two or more common atoms, with at least one of the rings containing atoms other than carbon.
Purine
A heterocyclic aromatic organic compound, forming the basis of two of the four nucleotides that constitute DNA and RNA (adenine and guanine).
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