| http://www.w3.org/ns/prov#value | - That is, although the dehydration reaction of ???Step 4-1??? may vary depending on the starting material, and is not particularly limited as long as it can be effected under similar conditions as in this process and processes known in the art can be used (for example, as described in H. O. House. ???Modern synthetic reactions??? W. A. Benjamin, Inc., p. 629-653, 1972).
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