Visa Information
Formalities to come to France (and the Schengen area) for foreign nationals
Because the meeting is a chemistry meeting therefore a "conference related to your professional activity", any person from outside the EU Schengen area, or countries part of the visa waiver system is required to be in possession of a valid short-stay visa to access the Schengen area.
It will allow you to visit France for the duration of your visit, which must not exceed 90 days.
All data and explanations for the applications are found here:
https://france-visas.gouv.fr/web/france-visas/voyages-d-affaires
Please let us know if/when you need an official letter.