The Combined Nomenclature (CN), v1:2022
formyloxy-2-phenylacetamido]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid, 1-[2-"1,3-dioxan-2-yl"ethyl]-2-methylpyridinium bromide, and
https://www.dst.dk/en/Statistik/dokumentation/nomenklaturer/kn?id=497f7f14-fa7f-4071-9de4-1b84ac270444