obsolete ergothioneine biosynthesis from histidine via hercynylcysteine sulfoxide synthase (obsolete GO:0140479)
OBSOLETE. A biosynthetic process that results in the formation of ergothioneine from histidine via a set of steps including the hercynylcysteine sulfoxide synthase reaction, which converts N-alpha,N-alpha,N-alpha-trimethyl-L-histidine directly to hercynylcysteine sulfoxide.