The must be paid liabilities you mention are real but the debenture liabilities will be extended by Sabby (they won't put NSPX in default). The derivative liability will most likely expire worthless like most have done. The accounts payable can be negotiated and the ones that must be paid sabby will pay like they did in December and add some more to debt. So I'm saying the actual must be paid liabilities is somewhere between 500K and 1Mil.
Of the 1.8 million of accrued expenses on the balance sheet are 1.4 miliion for compensation and benefits owed to past employees and most likely board members. The money may be owed but there has been now mention of legal action from them to file suits for the money. That figure has remained constant from the 2018 10-k. Although the money is owed it is a stretch to categorize them as "must be paid" in the current sense of NSPX's financial woes.
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