Diphosphatidylglycerol OH 0 CH2-C-CH2 0 CH2-O-C-R1 O H 0 0 CH2-O-C-R3 R2-C-O-CH O=POH O-POH R4-C-OCH CH2 -0 CH2 Diphosphatidylglycerol C O CH O R2 CH2 CH2 O C O R1 O P O O OH CH2 C OH H CH2 O O P O OH CH2 C O CH O R4 CH2 O C O R3