Provided herein are biofilm inhibitors obtained from marine microbial derived natural product extracts from Streptomyces gandocaensis, resulting in biofilm inhibitors, cahuitamycins. Also provided are mutant S. gandocaensis, methods of inhibiting biofilm formation, methods of producing, or increasing the production of, cahuitamycins, methods for synthesizing cahuitamycins, and methods of purifying cahuitamycins.