A compound represented by Formula: or a salt thereof, wherein: R 1, R 2, R 3, R 4, and R 5 are independently selected from the group consisting of: H, halogen, -OR 10, -N(R 10) 2, -SR 10, -CN, -NO 2, -OC R 10, -C R 10, -C OR 10, - C N(R 10) 2, -S 2 R 10, -S 2 OR 10, optionally substituted C 1-20 alkyl, optionally substituted C 2-20 alkenyl, optionally substituted C 2-20 alkynyl, optionally substituted C 3 - 20 carbocycle, and optionally substituted 3- to 20-membered heterocycle, wherein at least one of R 1 and R 3 is selected from the group consisting of -OR 10, -N(R 10) 2, -SR 10, -OC R 10, -C R 10, - C OR 10, -C N(R 10) 2, -S 2 R 10, -S 2 OR 10, substituted C 1-20 alkyl, optionally substituted C 2-20 alkenyl, optionally substituted C 2-20 alkynyl, optionally substituted C 3 - 20 carbocycle, and optionally substituted 3- to 20-membered heterocycle; R 6 is selected from the group consisting of -OR 11, -N(R 11) 2, -SR 11, optionally substituted C 1-20 alkyl, optionally substituted C 2-20 alkenyl, and optionally substituted C 2-20 alkynyl; R 7 and R 8 are independently selected from H, optionally substituted C 1-10 alkyl, optionally substituted C 2-10 alkenyl, optionally substituted C 2-10 alkynyl, optionally substituted C 3-12 carbocycle and optionally substituted 3- to 12-membered heterocycle; R 10 is independently selected at each occurrence from the group consisting of H, optionally substituted C 1-10 alkyl, optionally substituted C 2-10 alkenyl, optionally substituted C 2-10 alkynyl, optionally substituted C 3-12 carbocycle and optionally substituted 3- to 12-membered heterocycle; and R 11 is independently selected at each occurrence from the group consisting of optionally substituted C 1-10 alkyl, optionally substituted C 2-10 alkenyl, and optionally substituted C 2-10 alkynyl. R 1, R 2, R 3, R 4, and R 5 are independently selected from the group consisting of: H, halogen, -OR 10, -N(R 10) 2, -SR 10, -CN, -NO 2, -OC R 10, -C R 10, -C OR 10, - C N(R 10) 2, -S 2 R 10, -S 2 OR 10, optionally substituted C 1-20 alkyl, optionally substituted C 2-20 alkenyl, optionally substituted C 2-20 alkynyl, optionally substituted C 3 - 20 carbocycle, and optionally substituted 3- to 20-membered heterocycle, wherein at least one of R 1 and R 3 is selected from the group consisting of -OR 10, -N(R 10) 2, -SR 10, -OC R 10, -C R 10, - C OR 10, -C N(R 10) 2, -S 2 R 10, -S 2 OR 10, substituted C 1-20 alkyl, optionally substituted C 2-20 alkenyl, optionally substituted C 2-20 alkynyl, optionally substituted C 3 - 20 carbocycle, and optionally substituted 3- to 20-membered heterocycle; R 6 is selected from the group consisting of -OR 11, -N(R 11) 2, -SR 11, optionally substituted C 1-20 alkyl, optionally substituted C 2-20 alkenyl, and optionally substituted C 2-20 alkynyl; R 7 and R 8 are independently selected from H, optionally substituted C 1-10 alkyl, optionally substituted C 2-10 alkenyl, optionally substituted C 2-10 alkynyl, optionally substituted C 3-12 carbocycle and optionally substituted 3- to 12-membered heterocycle; R 10 is independently selected at each occurrence from the group consisting of H, optionally substituted C 1-10 alkyl, optionally substituted C 2-10 alkenyl, optionally substituted C 2-10 alkynyl, optionally substituted C 3-12 carbocycle and optionally substituted 3- to 12-membered heterocycle; and R 11 is independently selected at each occurrence from the group consisting of optionally substituted C 1-10 alkyl, optionally substituted C 2-10 alkenyl, and optionally substituted C 2-10 alkynyl.