<unk>  is a tetracycline antibiotic. It is used as a precursor in the industrial synthesis of doxycycline hyclate. It should not be confused with the antibiotic methicillin (aka meticillin).
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Metacycline
Minocycline
Tetracycline 
Anthracycline
Minocycline hydrochloride
Quinolone
Daptomycin
Oxytetracycline