Quadratanium
From Memory Alpha, the free Star Trek reference
Quadratanium is a common compound of the Federation in the 24th century. This compound, in a finely ground state, could be procured from ship's stores.
One of the uses of quadratanium was as a topical ointment for the skin conditions of Soong-type androids. If ingested orally, the android will suffer a condition similar to unconsciousness in Humans.
When Lore stayed aboard the USS Enterprise-D in 2364, he visited ship's stores on deck four where he picked up a macrotool and samples of quadratanium. With the compound, Lore spiked a glass of champagne which he presented to his "brother" Data. Upon drinking the concoction, Data lapsed into unconsciousness. (TNG: "Datalore")
Though not identified by name, The script make it clear that the "silver metal bits" Lore pours into Data's glass of champagne are pieces of finely ground quadratanium.
