I don't have data on it, but shouldn't the pressure around a black hole be extremely high? Therefore I would assume that all matter would transition towards the high-pressure allotropes, so for organic molecules I would expect the formation of diamond-like carbon (DLC).

Molecular chemistry in extreme environments, such as the vicinity of black holes, explores how molecules behave under intense radiation, strong gravitational fields, and high-energy particle fluxes. Polycyclic aromatic hydrocarbons (PAHs) and prebiotic compounds are typically stable under ordinary interstellar conditions, but the environment near a black hole is extraordinarily hostile. The immense gravitational tidal forces, combined with X-ray and gamma-ray radiation from the accretion disk, can break molecular bonds, ionize atoms, and trigger complex chemical reactions. Shock waves in relativistic winds can further fragment or strip molecules, making long-term survival of intact PAHs or prebiotic molecules unlikely close to the event horizon.

However, some molecules might survive in less extreme regions slightly farther from the black hole or within dense clumps of gas and dust that provide shielding from the harsh radiation. Observations of molecular species in extreme astrophysical environments, such as near active galactic nuclei, suggest that molecules can exist transiently or be regenerated through rapid chemical pathways. While intact prebiotic molecules may not persist directly in the fast, irradiated winds around black holes, fragments or simpler precursor molecules could survive and potentially participate in downstream chemistry if they are transported to cooler, more shielded regions. This indicates that while the immediate vicinity is destructive, molecular survival and complex chemistry are possible in niche, partially protected zones.