The present invention provides, in part, a compound selected from the group consisting of: 1,1,1,3,3,3-hexafluoropropan-2-yl (3R)-3-{[(cyclopropylmethyl)sulfonyl]amino}-1-oxa-8-azaspiro[4.5]decane-8-carboxylate; 1,1,1,3,3,3-hexafluoropropan-2-yl (3R)-3-[(cyclopropylsulfonyl)amino]-1-oxa-8-azaspiro[4.5]decane-8-carboxylate; 1,1,1,3,3,3-hexafluoropropan-2-yl 3-{[(cyclopropylmethyl)sulfonyl]amino}-1-oxa-9-azaspiro[5.5]undecane-9-carboxylate; 1,1,1,3,3,3-hexafluoropropan-2-yl 3-{[(cyclopropylmethyl)sulfonyl]amino}-1-oxa-9-azaspiro[5.5]undecane-9-carboxylate, ENT-1; and 1,1,1,3,3,3-hexafluoropropan-2-yl 3-{[(cyclopropylmethyl)sulfonyl]amino}-1-oxa-9-azaspiro[5.5]undecane-9-carboxylate, ENT-2, and pharmaceutically acceptable salts thereof; processes for the preparation of; intermediates used in the preparation of; and compositions containing such compounds or salts, and their uses for treating MAGL-mediated diseases and disorders including, e.g., pain, an inflammatory disorder, depression, anxiety, Alzheimer's disease, a metabolic disorder, steatohepatitis [e.g. nonalcoholic Steatohepatitis (NASH)], stroke, or cancer.