四百 よんひゃく よん びょう そとだったら
yonhyakuyombyōno sotodattara

Noun
Da Copula

The "-tara" conditional form ("if/when…") of 四百四病の外

1. If/when [it is] not the four-hundred-four illness.; If [it is] something other than the four-hundred-four illness.

Tara Conditional