A compound of the Formula: or a salt thereof, wherein: XisN; Y is O; R 1 is H, OH, J, OJ, SJ, or NJJ', wherein J or J' is a one to ten carbon linear, branched, non-aromatic cyclic, or aromatic cyclic, saturated or unsaturated, optionally substituted alkyl group, wherein the optional substituent is selected from one or more of: oxo, COOH, OH, F, Cl, Br, I, NH 2, CN, SH, SO 3 H, and NO 2; R 2 is H or a one to ten carbon linear, branched, or non-aromatic cyclic, saturated or unsaturated, optionally substituted alkyl group, wherein the optional substituent is selected from one or more of: oxo, COOH, R, OH, OR, F, Cl, Br, I, NH 2, NHR, NR 2, CN, SH, SR, SO 3 H, SO 3 R, SO 2 R, OSO 3 R, and NO 2, and wherein R is an linear, or branched saturated and unsubstituted C1-C10 alkyl; R 3 is H, OH, OG, SG, NGG' or a one to ten carbon linear, branched, or non-aromatic cyclic, saturated or unsaturated, optionally substituted alkyl group, wherein G and G' are a one to ten carbon linear, branched, or non-aromatic cyclic, saturated or unsaturated alkyl group and wherein the optional substituent is selected from one or more of: oxo, COOH, OH, F, Cl, Br, I, NH 2, CN, SH, SO 3 H, and NO 2; R 4 is H or a one to four carbon linear, or branched, saturated optionally substituted alkyl group, wherein the optional substituent is selected from one or more of: oxo, OH, F, Cl, Br, I, and NH 2; R 5 is H or a one to ten carbon linear, branched, or non-aromatic cyclic, saturated or unsaturated, optionally substituted alkyl group, wherein the optional substituent is selected from one or more of: oxo, COOH, OH, F, Cl, Br, I, NH 2, SO 3 H, and NO 2; Z is an optionally substituted Bu, Pr, Et, or Me, wherein the optional substituent is selected from one or more of: oxo, COOH, OH, F, Cl, Br, I, NH 2, SO 3 H, and NO 2; --------- is a single bond or a double bond; and provided that the compound is not: (2 S, 5 S, 7 S, 15 S)-dysideapyrrolidone, XisN; Y is O; R 1 is H, OH, J, OJ, SJ, or NJJ', wherein J or J' is a one to ten carbon linear, branched, non-aromatic cyclic, or aromatic cyclic, saturated or unsaturated, optionally substituted alkyl group, wherein the optional substituent is selected from one or more of: oxo, COOH, OH, F, Cl, Br, I, NH 2, CN, SH, SO 3 H, and NO 2; R 2 is H or a one to ten carbon linear, branched, or non-aromatic cyclic, saturated or unsaturated, optionally substituted alkyl group, wherein the optional substituent is selected from one or more of: oxo, COOH, R, OH, OR, F, Cl, Br, I, NH 2, NHR, NR 2, CN, SH, SR, SO 3 H, SO 3 R, SO 2 R, OSO 3 R, and NO 2, and wherein R is an linear, or branched saturated and unsubstituted C1-C10 alkyl; R 3 is H, OH, OG, SG, NGG' or a one to ten carbon linear, branched, or non-aromatic cyclic, saturated or unsaturated, optionally substituted alkyl group, wherein G and G' are a one to ten carbon linear, branched, or non-aromatic cyclic, saturated or unsaturated alkyl group and wherein the optional substituent is selected from one or more of: oxo, COOH, OH, F, Cl, Br, I, NH 2, CN, SH, SO 3 H, and NO 2; R 4 is H or a one to four carbon linear, or branched, saturated optionally substituted alkyl group, wherein the optional substituent is selected from one or more of: oxo, OH, F, Cl, Br, I, and NH 2; R 5 is H or a one to ten carbon linear, branched, or non-aromatic cyclic, saturated or unsaturated, optionally substituted alkyl group, wherein the optional substituent is selected from one or more of: oxo, COOH, OH, F, Cl, Br, I, NH 2, SO 3 H, and NO 2; Z is an optionally substituted Bu, Pr, Et, or Me, wherein the optional substituent is selected from one or more of: oxo, COOH, OH, F, Cl, Br, I, NH 2, SO 3 H, and NO 2; --------- is a single bond or a double bond;