English to Spanish Science Chemistry; Chem Sci/Eng

En un artículo titulado "In vitro antiprogestational/antiglucocorticoid activity and progestin and glucocorticoid receptor binding of the putative metabolites and synthetic derivatives of CDB-2914, CDB-4124, and mifepristone" (Actividad antiprogestacional / antiglucocorticoide in vitro y unión al receptor de progesterona y glucocorticoides de los metabolitos putativos y derivados sintéticos del CDB-2914, CDB-4124 y la mifepristona):

"We have examined the functional activities and potencies, in various cell-based assays, and relative binding affinities (RBAs) for progesterone receptors (PR) and glucocorticoid receptors (GR) of the putative mono- and didemethylated metabolites of CDB-2914, CDB-4124, and mifepristone and of the 17α-hydroxy and **aromatic A-ring derivatives of** CDB-2914 and CDB-4124. The binding affinities of the monodemethylated metabolites for rabbit uterine PR and human PR-A and PR-B were similar to those of the parent compounds. "

Aromatic ring = anillo aromático y derivatives = derivados, pero desconozco a qué se refiere la "A" en este caso.

Muchas gracias por sus sugerencias