Talk to a lawyer, fast. You're a creditor. Owing somebody money hurts their acquisition negotiations, which is the reason for their original offer. Get lawyer

Talk to a lawyer, fast. You're a creditor. Owing somebody money hurts their acquisition negotiations, which is the reason for their original offer. Get lawyers involved while the company is still a legal entity. If you delay until they no longer exist, the new entity may not be liable to pay you either and you'll be trying to hunt down individual founders, which is not going to be any easier.