Arsole, also called arsenole or arsacyclopentadiene, is an organoarsenic compound with the formula C4H4AsH. It is classified as a metallole and is isoelectronic to and related to pyrrole except that an arsenic atom is substituted for the nitrogen atom.
On a side note, I never use the "analyze" and "explore" modes because I am training myself for OTB (Over The Board) tournaments at university.