| 摘要 |
A compound of formula (I) and salts and solvates thereof, wherein: R10 is a nitrogen protecting group and R11 is either OH or O-R12, wherein R12 is an oxygen protecting group, or R10 and R11 together form a double bond between N10 and C11; and R10' and R11' are selected from the same options as R10 and R11 respectively.
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