Y12, BTP-4F-12, Y6-BO, BO-4F, CAS No 2389125-23-7, OPD Oximetry Photoplethysmography January 10, 2025September 8, 2023 by Steven Xiao COA_BTP-4F-12_DW5156P-example 1M UCSB Y12 Wearable OPD Oximetry photoplethysmography 2024 1M UCSB green solvent Y12 DTY6