passages.id: split_5_test_2124_passage
passages.type: progene_text
passages.text: Two compounds , 15a (2-acetamido-4-(2-amino-5-methoxyphenyl)-4-oxobutyric acid ) and 15c (2-butyramido-4-(2-amino-5-methoxyphenyl)-4-oxobutyric acid ) , displayed more potent activities than the other synthetic compounds tested for the inhibition of NMDA excitability and nNOS activity .