Tetrasodium tris(bathophenanthroline disulfonate)ruthenium(II)

Tetrasodium tris(bathophenanthroline disulfonate)ruthenium(II) (Na4Ru(bps)3) is a sodium salt of coordination complex. In this form, it is the salt of a sulfonic acid.

Source: Wikipedia — Tetrasodium tris(bathophenanthroline disulfonate)ruthenium(II) (CC BY-SA 4.0)