Prostaglandins are lipid substances derived from fatty acids, which act as powerful biochemical regulators.
In Wade's Organic Chemistry, they indicate that there are several families of prostaglandins (A, B, C, …) and that, according to this classification, a prostaglandin could be formulated as PGA1 or PGA2.
As an introduction it is very well explained, but I would like to go deeper into its nomenclature. I have searched on the Internet, but I have found nothing.
For example, the next prostaglandin is PGB1, but I don't know why. Nor would I know how to formulate one from its structure.