Dear Client
Thank you for reaching out to me. I have seen your sheet which has about 43 chemical compounds and structures. Apparently, these are all known compounds and I should be able find out the references of their existence in scientific and patent literature. If you need the references for each of these from scientific and/or patent literature, I shall be happy to do it for you and can complete the task in one day. if you would specifically want me to get the specific numbers in the CAS register or reference in STN database, you would need to provide me molecular formulae for each of the compound along with url of the specific database along with username/pw etc. you would want me to check. Or else, I may be given freedom to look into any data source I can access.
Kindly revert back early, if you are interested. I am keeping myself free on coming Monday for your task.
Rajendra