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Lactones

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erythromycin A methoxime

(53066-26-5)
Lexithromycin is an early semi-synthetic erythromycin, prepared by reaction of the 9-keto moiety to methyl oxime. The structural change improves the pH stability profile and hydrophobicity of lexithromycin for better in vivo absorption. This same rationale was used to greater effect with roxithromycin and, as a result, lexithromycin was quickly superseded and has not been not extensively studied. Like all erythromycins, lexithromycin shows broad spectrum antibacterial activity and acts by bindin

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Erythromycin, 9-oxime, (9Z)-

(134931-01-4)
(9Z)-Erythromycin A Oxime is a metabolite of Roxithromycin (R700850) in humans.

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Ethyl4-(5-methyl-3-phenylisoxazol-4-yl)benzenesulfonate

(1884279-18-8)

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Lactone refers to an organic substance that contains both a carboxyl group and a hydroxyl group in the same molecule, and the two are dehydrated. Organic compounds with one and only one ester group in the ring. Common ones are x=2, 3 or 4, which are called β-, γ- or δ-lactones, respectively. They are generally insoluble in water, easily soluble in organic solvents such as ethanol and ether, and their density is generally lower than that of water.
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