with the oxygen atom of at least one of the etherified hydroxy groups further bound to an acyclic carbon atom

Full Title

Sulfonic acids; Halides, esters, or anhydrides thereof > Sulfonic acids > having sulfo groups bound to acyclic carbon atoms > of an acyclic saturated carbon skeleton > containing oxygen atoms bound to the carbon skeleton > containing etherified hydroxy groups bound to the carbon skeleton > with the oxygen atom of at least one of the etherified hydroxy groups further bound to an acyclic carbon atom