Compound library

A method for producing a library, comprising:

• (a) preparing supporting carriers to which a first building block (first BB) is covalently linked (first BB-supporting carriers), wherein the first BB-supporting carriers are solid-phase carriers comprising na types of first building blocks (first BB1 to first BBna) (first BB1-na-supporting carriers), the first BB1-na moieties of the first BB1-na-supporting carriers each have a reactive functional group for forming a bond with a second building block (second BB), and the reactive functional groups contained in the first BB1-na-supporting carriers are of one type or two or more types;
• (b) preparing mixtures of supporting carriers having the reactive functional group common among the first BB1-na-supporting carriers, and reacting each mixture with one type of second building block introduction reagent (second BB introduction reagent) or a mixture of two or more types of second BB introduction reagents to prepare supporting carriers in which the second BB is covalently linked to the first BB (second BB-first BB-supporting carriers), wherein the resulting supporting carriers are supporting carriers comprising nb types of second building blocks (second BB1 to second BBnb) (second BB1-nb-first BB1-na-supporting carriers), and any of the second BB1 introduction reagent to the second BBnb introduction reagent reacts with the respective reactive functional groups of the first BB1-na-supporting carriers to form first linkers (first L);
• and
• (e) cleaving compounds from the solid-phase carriers, wherein
• na is an integer of 2 or larger, nb is an integer of 2 or larger, and the resulting compound library comprises 100 or more types of compounds as a mixture.