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He’s a lab rat.

The Florida chemistry whiz charged with injecting opioids underneath his neighbor’s front door — because of a noisy toilet seat — used the laboratory at his university to carefully mix the dangerous toxins, according to court papers obtained by The Post.

Xuming Li, 36, used a “laboratory on the University of South Florida campus to mix and load liquid syringes on multiple occasions with the intent to harm residents of the condominium,” the breach of contract filing by the building’s owners association states.

Li was a Ph.D. chemistry student at the university until summer 2023, USF confirmed to WFLA.

The chemist was arrested on June 27 after his neighbor, Umar Abdullah, caught him on a hidden camera crouching down and squirting a clear liquid into a crack in the door frame.

A hazmat test revealed the “liquid chemical agent” contained a combination of methadone and hydrocodone — both opioid pain medications.

Word of the shocking poisonings sent other residents of the Oxford Place at Tampa Palms into a state of panic, according to the suit, which seeks to boot Li and his co-owner roommate from the complex.

“The actions by defendant have risen to the point that residents and owners feel unsafe within their properties and the condominium,” the filing states.

In a statement, the University of South Florida said, “The safety and well-being of the USF community is our highest priority. The USF Department of Chemistry has several safeguards in place to ensure all chemicals and other materials owned by the university for teaching and research purposes are accounted for and used properly.

USF’s chemistry labs do not house chemicals that are classified as Schedule II controlled substances, which includes hydrocodone and methadone.”

Abdullah told local outlet WFLA that he, his pregnant wife, and their young daughter moved into the complex directly above Li in June 2022.

Li soon began sending angry texts to his new neighbors, complaining that he was losing sleep over the sound of a toilet seat clanging.

Soon after, the family suddenly began experiencing unexplained bouts of nausea and dizziness.

“I look at my daughter,” Abdullah recalled. “Her eyes were full of tears. She was not crying, but her eyes were full of tears.”

A family friend first noticed a chemical odor while grabbing a package for them while they were away on vacation.

Abdullah then also noticed the scent and suspected an issue with his water heater.

However, the stench persisted even after he replaced the appliance and had his air ducts and vents cleaned.

Desperate for a resolution, he called the fire department, who conducted tests but found nothing amiss.

“I never thought after all this that no,” Abdullah said. “I’m just imagining this. No.”

He eventually noticed a small crack in his doorway and began to suspect his disgruntled neighbor.

After falling ill yet again, he set up a hidden camera outside his door and was shocked to see Li crouching down and emptying a syringe under his front door.

“We were shaking,” Abdullah recalled to WFLA. “We can’t imagine that he is coming and doing something.”

He immediately vacated the condo and called police, who arrested Li and slapped him with a slew of felony raps including possession of a controlled dangerous substance.

Li was released on bond and is slated to appear in court next on Dec. 5.

The owners association’s bid to evict Li and his roommate is ongoing.