Related Objects of Interest: (a) benzyl penicillin , (a) oxytetracycline , (a) propanolol , (b) benzathine benzyl penicillin , (b) chlortetracycline , (b) isopreterenol , (c) doxycycline , (c) procane benzyl penicillin , (c) sotalol , (d) dichloro isopreterenol