Are there alternatives to 4-Methyl-3-pyridinesulfonic acid (CAS: 4808-71-3) in synthesis?

There are several alternatives to 4-Methyl-3-pyridinesulfonic acid (CAS: 4808-71-3) that can be used in synthesis. Common alternatives include other sulfonic acids like methanesulfonic acid or benzenesulfonic acid. These alternatives may offer similar functionalities but with different chemical properties. Other options include using inorganic acids or other organic acids, depending on the specific requirements of the synthesis process.