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The compounds of sterols such as C_ 27 、C_ 28 、C_ 29 and C_ 30 are recorded from C-8 core of the Chukchi Sea. The double bond position is located at 5-, 5,22 as well as 22-,24-. The compound of sterols such as C_ 27 、C_ 28 、C_ 29 are recorded from B2-9