SRX18389191 1 SRP410010 bp0 SELEX pools where amplified using PCR, afterwhich ExoSAP-IT reagent was used to degrade remaining primers and nucleotides. The sample was then submitted to the FIU DNA Core Facility for sequencing. SRS15873573 Fentanyl_R9 1 SELEX SYNTHETIC PCR Ion Torrent PGM SRX18389192 2 SRP410010 bp0 SELEX pools where amplified using PCR, afterwhich ExoSAP-IT reagent was used to degrade remaining primers and nucleotides. The sample was then submitted to the FIU DNA Core Facility for sequencing. SRS15873574 Fentanyl_R11 2 SELEX SYNTHETIC PCR Ion Torrent PGM SRX18389193 3 SRP410010 bp0 SELEX pools where amplified using PCR, afterwhich ExoSAP-IT reagent was used to degrade remaining primers and nucleotides. The sample was then submitted to the FIU DNA Core Facility for sequencing. SRS15873575 Acetyl_Fentanyl_R8 3 SELEX SYNTHETIC PCR Ion Torrent PGM SRX18389194 4 SRP410010 bp0 SELEX pools where amplified using PCR, afterwhich ExoSAP-IT reagent was used to degrade remaining primers and nucleotides. The sample was then submitted to the FIU DNA Core Facility for sequencing. SRS15873576 Acetyl_Fentanyl_R10 4 SELEX SYNTHETIC PCR Ion Torrent PGM SRX18389195 5 SRP410010 bp0 SELEX pools where amplified using PCR, afterwhich ExoSAP-IT reagent was used to degrade remaining primers and nucleotides. The sample was then submitted to the FIU DNA Core Facility for sequencing. SRS15873577 Furanyl_Fentanyl_R7 5 SELEX SYNTHETIC PCR Ion Torrent PGM SRX18389196 6 SRP410010 bp0 SELEX pools where amplified using PCR, afterwhich ExoSAP-IT reagent was used to degrade remaining primers and nucleotides. The sample was then submitted to the FIU DNA Core Facility for sequencing. SRS15873578 Furanyl_Fentanyl_R10 6 SELEX SYNTHETIC PCR Ion Torrent PGM