Further optimization showed
that a methoxy substitution at the 4-position on the indole unit was highly favorable for enhancing the inhibitory potency .
Further optimization showed that a methoxy substitution at the 4-position on the indole unit was highly favorable for enhancing the inhibitory potency .
Further optimization showed that a methoxy substitution at the 4-position on the indole unit was highly favorable for enhancing the inhibitory potency .