Abstract: A compound of the formula ##STR1## wherein n = 2 or 3; R.sub.1 is a C.sub.3 -C.sub.20 alkyl or arylalkyl; R.sub.2 is loweralkyl or phenyl; and R.sub.3 is H or replaces the hydrogens in (CH.sub.2).sub.n with CH.sub.3 ; and m is 1, 2 or 4.These compounds exhibit central nervous system activity and are useful as antidepressants.

Abstract: A solvent vapor venting dust cover unit which automatically vents all volatile solvent vapors arising during the fraction collection procedure.

Abstract: 2,4,7-Substituted 5-hydroxy benzopyrans and dihydrobenzopyrans and their esters represented by the formulae ##SPC1##Wherein each R.sub.1 is loweralkyl, and R.sub.2 is hydrogen, loweralkanoyl or ##SPC2##With Y being a straight or branched chain alkylene group having from 1-8 carbon atoms; a is an integer from 1-4; b is an integer from 1-4; X is CH.sub.2, O, S, or NR.sub.5 with R.sub.5 being hydrogen or loweralkyl, with the limitation that when X is O, S, or NR.sub.5, the sum of a and b is 3 or 4 and R.sub.4 is hydrogen or loweralkyl; and R.sub.3 is ##SPC3##With Y' being a straight or branched chain alkylene group having from 1-10 carbon atoms; and each R.sub.7, R.sub.8 and R.sub.9 are the same or different members of the group consisting of hydrogen, halo, trifluoromethyl or loweralkyl and the pharmaceutically acceptable salts thereof.