Voyeur lounge

Once you've done all research you care for at the moment, the leftover chemicals will be virtually useless. And it's not like you are going to stop working with subjects just because their samples are of no more use to you right now, that's not what this game is for. Now, you could, of course, just sell it into the market and be done with it, turning the surplus into cash the most boring way possible.

Or.

You double the area of one of the test rooms in the direction away from the elevator and install a one-way mirror where the wall used to be.

You set up a lounge on the other side, with dim lighting and hookah and an extensive list drinks, including cocktails with some special ingredients mixed in (leftover samples are still digestible, after all).

On your side you place several racks with subjects, possibly of different species and genders so as to cater to everyone's taste (volunteers or research subjects, since having them pay you for this type of employment would feel wrong, those who are willing to participate so much they are willing to pay for it can just sign up as volunteers).

You decide on working hours of the lounge, set hourly rates for visitors (with drinks possibly made complimentary or setting a quota of number of drinks per hour per person) and either tend to subjects yourself or assign your lab assistants to do it instead, possibly training them individually beforehand in the art of getting the most out of those locked up.

*Training would, of course, include having several sessions with your assistant acting as a test subject, or vice versa, or a mix of the two, or them observing your work with regular test subjects and taking notes; breaking them into complete submission, making them obnoxiously dominant, guiding them through altering person's preferences via chemistry or hands-on interaction, etc. You know, fully introducing them to what this lab is capable of.

For flavour, you may want to turn a couple of sections of the mirror into revolving panels and place portal devices on them, with, for instance, a couple of male horse-morphs connected to the devices, edged by machinery throughout the opening hours, their dicks producing a steady flow of precum. Metal or ceramic trenches can be installed just beneath the panels, extending at a slight incline to individual sofas, so that your visitors can freely help themselves to it. Requests to increase the stimulation to finally let them cum can be either accepted at a fixed price or auctioned off for each subject individually, with the winning bidder deciding on how exactly, if at all, they will be brought to their orgasm at the end of opening hours.

Add some sexy downtempo in the background, decide on dress code for your clients, and don't forget to assure them they can be as frivolous as they please (after all, the fun does not have to be limited to the opposite side of the mirror), and that spontaneous orgies are welcome here. Some aphrodisiac in cocktails may serve as a stimulus for them to do whatever they want to.

This way, you still turn profit from your surplus of collected chemicals, but extract some amusement in the process.

This is an endless pain to code though.