An object of the present invention is to provide a carbapenem synthetic intermediate which is advantageous in an industrial process. There are provided a process for producing Compound (I), or a pharmaceutically acceptable salt, or a solvate, or a crystal thereof, comprising reacting Compound (III) and Compound (IV) in the presence of the secondary amine, and a benzyl alcoholated crystal of Compound (I). There are further provided a method of deprotecting Compound (I) with a Pd catalyst, and a crystal of Compound (IV).