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US4218451A Penicillins and their use 失效
青霉素及其用途

Penicillins and their use
摘要:
New penicillins of the formula ##STR1## in which ##STR2## E is oxygen or sulphur, and R.sub.1 and R.sub.2 are hydrogen or various organic radicals with certain provisos,or salts thereof, are antibacterially ative and useful as antibiotics in pharmacy, as animal feed supplements for promoting growth, and as preservatives.
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