Fig. 1

Chemical structures of compounds 1–13. a Diketopiperazines (DKPs) synthesized by DmtB1 (1–5); b pre-drimentines (pre-DMTs, 6–8 and 13); c drimentines (DMTs, 9–12)
Chemical structures of compounds 1–13. a Diketopiperazines (DKPs) synthesized by DmtB1 (1–5); b pre-drimentines (pre-DMTs, 6–8 and 13); c drimentines (DMTs, 9–12)