achemso.bst

FUNCTION { bbl.first }  { "1st" }

FUNCTION { bbl.second } { "2nd" }

FUNCTION { bbl.third }  { "3rd" }

FUNCTION { bbl.fourth } { "4th" }

FUNCTION { bbl.fifth }  { "5th" }

FUNCTION { bbl.st }     { "st" }

FUNCTION { bbl.nd }     { "nd" }

FUNCTION { bbl.rd }     { "rd" }

FUNCTION { bbl.th }     { "th" }