There are many compound collectors already. However, none of them accept all the compounds. They purchase compounds highly selectively.
Therefore MDPI has set up alternative programs for sample deposit and exchange services: you publish your compounds in the MDPI databases and you may deposit all or one unit amount of your compounds and MDPI pays 50% of the net profit of the MDPI sample distribution service afterwards. We sell them at a reasonable unit price or a price recommended by you.