This brown, round pill imprinted with GX EG3 L is a Chlorambucil 2 MG Oral Tablet [Leukeran], per the NIH.
LEUKERAN is a human prescription drug. The active pharmaceutical ingredient is chlorambucil and is classified as, "Alkylating Activity [MoA], Alkylating Drug [EPC]."
This pill is made by a total of 2 firms: (1) GlaxoSmithKline LLC, and (2) Aspen Global Inc..
There is 1 other brown pill that with a similar imprint: "GX EG3 L". They may be a different dosage of the same drug or a different drug entirely.