Explanatory notes
… not be known or be chemically defined. They are chemically diverse and include the following : (1) Heterocyclic , … acid skeleton of a ß-lactam of amino-(4-carboxy-5,5-dimethylthiazolidin-2-yl)acetic acid, in which the amine … as derivatives * . This subheading includes, inter alia , dihydrostreptomycin (INN) and streptoniazid (INN). However, …