Patent ID: 8871748

Claim:
A compound of formula (I), or an isomer thereof; wherein, n=0 to 4, and X=a direct bond, —CH 2 —CH 2 —O—, or —CH 2 —CH 2 —CH 2 —O—, and Z═H, —CH 2 —CH 2 —OH, —CH 2 —CH 2 —CH 2 —OH, —SO 3 H, —SO 3 M, —PO 3 H 2 , —PO 3 M, or —PO 3 M 2 , and R=a retinoid, or a carotenoid, and M=Na, K, Ca, Mg, Ba, Zn, Mn, Cu, Fe, Co, or Ni.