UNITED NATIONS — Buried in the annex of a United Nations inquiry into chemical weapons use in Syria is information that some outside analysts say could further implicate the government of Syria in the deadliest of the five confirmed attacks.

The investigators, who released their final report last week, said they had found a chemical called hexamethylenetetramine from environmental samples in Ghouta, the Damascus suburb that was the site of the deadliest attack, on Aug. 21. Hexamine, as the chemical is also known, can be used as an additive in the production of chemical weapons using sarin, the nerve agent, according to analysts, along with other commercial uses. The Syrian government happens to have a stockpile of hexamine; it is part of a list of chemicals scheduled to be destroyed as part of the deal to dismantle Syria’s chemical weapons program.

United Nations investigators who conducted the inquiry pointedly steered clear of assigning blame for any of the attacks. The investigators have declined to explain Syria’s purpose in amassing the hexamine, a common commercial chemical.

But some experts who reviewed the panel’s final report said the presence of hexamine at Ghouta was in some ways akin to the police finding red lipstick in a woman’s purse that matches collar stains on a murder victim. While considered circumstantial evidence, it added to information in the panel’s interim report on Ghouta released in September, on the type of projectiles used that appeared to implicate the Syrian government.