Rc is, independently at each occurrence, C1 6 alkyl, {HEAD ~ C2 6 alkenyl}, C2 6 alkynyl, ORa, Cl, {TAIL ~ F}, Br, ═O, CF3, —NRaRa1, —rCRa1, —rCORa1, —rCNRaRa1, —rNRaCRa1, —rSpRa3, —rSO2NRaRa1, or —rNRaSO2Ra3 
Rc is , independently at each occurrence , C1 6 alkyl , { HEAD ~ C2 6 alkenyl } , C2 6 alkynyl , ORa , Cl , { TAIL ~ F } , Br , ═ O , CF3 , — NRaRa1 , — rCRa1 , — rCORa1 , — rCNRaRa1 , — rNRaCRa1 , — rSpRa3 , — rSO2NRaRa1 , or — rNRaSO2Ra3
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH