Abstract: The subject invention involves compounds having the following structure: ##STR1## wherein: (a) R is unsubstituted C.sub.1 -C.sub.3 alkanyl or alkenyl;(b) R' is selected from hydrogen; unsubstituted C.sub.1 -C.sub.3 alkanyl or alkenyl; unsubstituted C.sub.1 -C.sub.3 alkylthio or alkoxy; hydroxy; thiol; cyano; and halo; and(c) R" is selected from hydrogen, methyl, ethyl and i-propyl.The subject invention also involves pharmaceutical compositions containing such novel compounds, and the use of such compounds for preventing or treating respiratory, ocular and/or gastrointestinal disorders.