Note: a previous post put forward the proposal by Dorsey of a 7 part structure. Further study leads me to suggest a variation – 6 parts with a double centre, contrasting the ritualistic worship in Jerusalem with the invitation of YHWH to help Judah come to true worship.
Isaiah 1
See also the same chiasm independently identified by Tony Robinson –
Tony Robinson has come up with the same pattern quite independently and he has set it out very clearly, so this has been added to the post.