Conformational and color polymorphism of achiral 2-methyl-3-(2-naphthalenylthio)-1,4-naphthalenedione

An achiral compound, 2-methyl-3-(2-naphthalenylthio)-1,4-naphthalenedione, shows conformational and color polymorphism, and each polymorph shows different optical properties and can be controlled by changing crystallization conditions.