请帮我解释一下下面这句话中AS 前的THEN 是干什么用的 还有not so much
问题描述：
请帮我解释一下下面这句话中AS 前的THEN 是干什么用的 还有not so much
The remarkable thing about many of the medicines dismissed then as ' snake oil'
is not so much that they failed to live up to the outrageous claims made for them .
答
...dismissed as, 作为,当作是,（被）看成是……如同：regard ...as...一样.
then, adv. = at that time, 当时,那时
not so much ( effective),不是特别的有效