White, ovoid-rectangular imprinted L484?

[Sbach]

My absent-minded young teen filled an unlabeled pill jar with these. Now none of us knows what they are. Among them is a half-pill; it is white throughout.

[tunafizzle]

Generic Name: Acetaminophen
Strength: 500mg
Manufacturer: (?)
Trade Name: Tylenol
Indications: Mild to moderate pain
Class: OTC
Image: N/A

[Cats Meow]

L484 is 500mg Acetaminophen