I agree with David. You may want to start your process with the certifying agency first, and listen to their evaluation requirements. May be they recommend or even mandate someone else than WES or the other one.
Also, there should be professional organizations of chemistry teachers. You may want to contact them as well.
Obtaining a course descriptions are a real problem in the FSU. The education system used to be targeting internal market only. There was no way to even try to promote international exchange of specialists. There is nothing in the universities bylaws, at least in the most of them, that prescribe universities to provide for course description on request.
Some people manage to get a course description somehow by making a personal appointment to the heads of a respective chair, explaining a situation and asking to provide a detailed description of a needed course or courses. Often an applicant offers to type the description herself and then submit it for signature, because this amount of work may not be covered by the state funding.
However, the course descriptions existed all the time. In the Soviet times, they were issued as a booklet, which was even freely sold in the bookstores. This booklet was the only thing that was allowed to take with you on the exam, as a student could have nothing on the exam just the clean sheet of paper to write his outlines. So the published course description could be of some help. Therefore, such descriptions still may be found in archives with a respective teaching chair at the university.