Bacitracin formula

OTC Topical with bacitracin (Bacimyxin, Polysporin) with bacitracin, neomycin (Neosporin, Triple Antibiotic) with bacitracin, neomycin, lidocaine (Lanabiotic, Spectrocin) with gramicidin (Polysporin) with gramicidin, lidocaine (Lidosporin, Polysporin Burn Formula) with gramicidin, neomycin (Neosporin)... 

This structure, although consistent with many facts, did not explain the peculiar properties of the A-terminal isoleucine and the negative test for —SH groups. Further experiments led to the conclusion that a thiazoline ring is formed between isoleucine and cysteine this was later proved to be correct. All these results led to the formula for bacitracin A which is now generally accepted - Figure 1.4). 

Fig. 1. Probable structural formula of bacitracin A (Regna, 1959) -> Signifies a C—N bond...

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