I don't have a CAS number for my sample. What should I do?

If you do not have a CAS number, you can leave this text field in your request empty and proceed with filling out the rest of the information. The CAS number field is not marked with a red star, which means that it is not a mandatory field to fill out. While it is advisable to provide the CAS number for easier identification, you can skip this field if you do not have it.