Figure 1

(a) Chemical structures of SP, SP-enol, and the four synthetic haptens. (b) Synthesis and activation of hapten SPm. (c) Synthesis and activation of hapten SPh.

(a) Chemical structures of SP, SP-enol, and the four synthetic haptens. (b) Synthesis and activation of hapten SPm. (c) Synthesis and activation of hapten SPh.