The present invention relates to solid forms of (S)-2-methoxy-3-{4-[2-(5-methyl-2-phenyl- oxazol-4-yl)-ethoxy]-benzo[b]thiophen-7-yl}-propionic acid, and of salts of (S)-2-methoxy-3-{4-[2-(5-methyl-2-phenyl-oxazol-4-yl)-ethoxy]-b enzo[b]thiophen-7-yl}- propionic acid.La presente invención se relaciona con formas sólidas de ácido (S)-2-metoxi-3-{4- [2-(5-metil-2-fenil-oxazol-4-il)etoxi]benzo[b]t iofen-7-il}-propiónico, y de sales de ácido (S)-2-metoxi-3-{4- [2-(5-metil-2-fenil-oxazol-4-il)etoxi]benzo[b]tiofen-7-il}-propió nico.
