How do you criss cross a compound with four elements in it?

Question

For example, folic acid and Thiamine mononitrate

Answer 1

Criss cross method only can be used to figure out an ionic compound formula. Folic acid (C₁₉H₁₉N₇O₇) and thiamine nononitrate (C₁₂H₁₇N₅O₄S) are organic compounds. It does not work.